DONT SKIP PLZ HELP IM DESPERATE

Answer: the first option is correct.

Step-by-step explanation:

In a geometric sequence, each consecutive term differ by a common ratio, r.

The formula for determining the nth term of a geometric progression is expressed as

an = a1r^(n - 1)

Where

a1 represents the first term of the sequence.

r represents the common ratio.

n represents the number of terms.

From the information given,

a = - 5

r = - 2

n = 3

Therefore, the 3rd term, T3 is

T3 = - 5 × - 2^(3 - 1)

T3 = - 5 × - 2^2

T3 = - 5 × 4

T3 = - 20

Using concepts of the normal distribution, it is found that the statement which is not true is:

C. A​ z-score is an area under the normal curve.

In a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

Thus, statement C is false, as the p-value is the area under the normal curve, not the z-score.

A similar problem is given at https://brainly.com/question/14243195

Answer:

Deepak: 4 t-shirts,

Tarun: 12 t-shirts,

Mahesh: 14 t-shirts.

Step-by-step explanation:

Let x represent number of t-shirts that Deepak has.

Please consider the complete question.

Tarun has 4 t-shirt more than twice the number of T-shirts Deepak has. Mahesh has 2 more than thrice the number of T-shirts Deepak has. If the ratio of the t-shirt that Tarun and Mahesh have is 6 : 7, find out the number of the t-shirt each of them has.​

Since Tarun has 4 t-shirt more than twice the number of T-shirts Deepak has, so the number of t-shirts that Tarun has would be [tex]2x+4[/tex].

We are also told that Mahesh has 2 more than thrice the number of T-shirts Deepak has. So the number of t-shirts that Mahesh has would be [tex]3x+2[/tex].

Since the ratio of the t-shirt that Tarun and Mahesh have is 6 : 7, so we can represent this information in an equation as:

[tex]\frac{2x+4}{3x+2}=\frac{6}{7}[/tex]  

Cross multiply:

[tex]6(3x+2)=7(2x+4)[/tex]

[tex]18x+12=14x+28[/tex]

[tex]18x-14x+12-12=14x-14x+28-12[/tex]

[tex]4x=16[/tex]

[tex]x=\frac{16}{4}=4[/tex]

Therefore, Deepak has 4 t-shirts.

The number of t-shirts that Tarun has would be [tex]2x+4\Rightarrow 2(4)+4=4+4=12[/tex]

Therefore, Tarun has 12 t-shirts.

The number of t-shirts that Mahesh has would be [tex]3x+2\Rightarrow 3(4)+2=12+2=14[/tex]

Therefore, Mahesh has 14 t-shirts.

Answer:

Therefore the critical value= 2.073

Step-by-step explanation:

The number of observation = 23.

For the mean of the population the confidence interval  = 95%.

Here mean and stander deviation of the distribution is not given. So we use t distribution.

T distribution is called as student's t distribution.

Sample number =n =23.

Confidence level = c= 95% =0.95

The degree of freedom is sample size decreased by 1

df=n-1 = 23-1 =22.

The critical value [tex]t^*[/tex] can be found in the row df = 22 and column with 0.95 of the T distribution table .

[tex]t^*[/tex] = 2.073

Therefore the critical value= 2.073

To calculate the critical value for a 95% confidence interval when the sample size is small (less than 30), we need to use the t-distribution. The critical value from the t-distribution will depend on the sample size (specifically, the degrees of freedom) and the desired level of confidence.
Here's how you could calculate this step by step without using the Python function mentioned:
**Step 1: Identify the desired confidence level.**
For a 95% confidence interval, we are interested in capturing the central 95% of the t-distribution.
**Step 2: Determine the degrees of freedom.**
The degrees of freedom (df) for a t-distribution is equal to the sample size minus 1. So with 23 observations, df = 23 - 1 = 22.
**Step 3: Find the critical t-value.**
We want to find the critical t-value for the t-distribution with 22 degrees of freedom that corresponds to the 95% confidence interval. This means we want to find the t-value such that 95% of the distribution lies between -t and +t. Because the t-distribution is symmetric, we can look up the critical value for 97.5% (to split the remaining 5% evenly on both tails of the distribution).
Using a t-distribution table (often found in the appendices of statistics textbooks) or a statistical computing resource, you would find the t-value that corresponds to a cumulative probability of 0.975 with 22 degrees of freedom.
**Step 4: Interpret the table or resource correctly.**
If you were looking at a table, you would look down the degrees of freedom column until you find 22, then right to the column that represents the 97.5% cumulative probability (remember, this is for the two-tailed test). That entry is the critical t-value that corresponds to a 95% confidence interval.
**Step 5: Use the critical t-value for constructing the interval.**
Once you have the critical t-value, you would use it to construct the confidence interval for the population mean by multiplying this t-value by the standard error of the sample mean and then add and subtract this value from the sample mean.
**Important Note:**
Please be aware that the exact t-value varies depending on the source of the statistical tables or the statistical software being used. The value also depends on the precision (number of decimals) presented in the table.
If you perform these steps with a standard statistical table or software, you should find that the critical t-value for a 95% confidence interval with 22 degrees of freedom is approximately 2.074.

Answer:

C < 22

Step-by-step explanation:

Answer:

B. x= 7

Step-by-step explanation:

6x = 42

x = 42 / 6

x = 7

The 6 is multiplying because of the x, this passes to the other side of the equal to split.

Answer:

(6,-6)

Step-by-step explanation:

well if you count over to the right 6 and down 6 that points would be

(6,-6)

Answer:

(6,-6)

Step-by-step explanation:

The answer is that because the x-axis for A  is positive and it is 6 points away from the origin. The  y-axis for A should negative this is because the quadrants are often numbered from 1st to 4th and denoted by Roman numerals: I (where the signs of the (x; y) coordinates are I (+; +), II (−; +), III (−; −), and IV (+; −). The point is also 6 units away from the origin.

The expression d^2 - 4d + 4 factors to (d - 2)^2.

To factor the expression d^2 + 4d + 4, we are looking for two binomials that will multiply together to give us the original quadratic expression. These binomials will be of the form (d - a)^2 because the last term is a perfect square (4 = 22) and the middle term is twice the product of the square roots of the first and last terms.
Here's the step-by-step factoring:
1. Identify the square root of the first term, which is d.
2. Identify the square root of the last term, which is 2.
3. Since our middle term is negative, we use negative signs in our binomials.
4. The factored form is (d - 2)^2, as this will expand to d^2 - 2*d*2 + 22, which simplifies to d^2 - 4d + 4.

Answer:

The answer to your question is 6.3 units

Step-by-step explanation:

Data

A (-2, 2)

B (4, 4)

Distance = ?

Formula

dAB = [tex]\sqrt{(x2 - x1)^{2} + (y2 - y1)^{2}}[/tex]

Substitution

x1 = -2   x2 = 4    y1 = 2   y2 = 4

dAB = [tex]\sqrt{(4 + 2)^{2} + (4 - 2)^{2}}[/tex]

Simplification

dAB = [tex]\sqrt{6^{2} + 2^{2}}[/tex]

dAB = [tex]\sqrt{36 + 4}[/tex]

dAB = [tex]\sqrt{40}[/tex]

Result

dAB = 6.3 units

Answer:

59/36π

Step-by-step explanation:

We know that an angle is measured in either degrees or radians and The arc's angle measurement, taken at the center of the circle the arc is part of, is measured in degrees (or radians)

Let's convert 90 degrees into radians

295° = 295 * π/180 = 59/36π

Answer:

Explanation:

If 112%  interest of bond amount = $27,498,250

∴ 100% principal amount = 27,498,250 X 100/112 = $24,552,008.93

10% bond interest = $24,552,008.93 X 0.10 = $2,455,200.89    

Between October 2018 and August 2019, it amounts = $2,455,200.09 X 11 = $27,007,209.82

The amount accrued up to September 2019 = $(27,007,209.82 + 27,498,250) = $54,505,459.82

From October 2019 to August 2020, it will amount = $(27,007,209.82 + 54,505,459.82) = $81,512669.64

The amount accrued up to September 2020 = $(81,512,669.64 + 27,498,250) = $109,010,919.64

Answer:

P(x = 300) = 1.45 × 10⁻⁷

Step-by-step explanation:

This is a normal distribution problem with mean number of points = μ = 182 points

Standard deviation = σ = 23 points

Probability that Allan will roll a perfect game (300 points), just by random chance.

First of, we need to normalize/standardize 300.

The standardized score for any value is the value minus the mean then divided by the standard deviation.

z = (x - μ)/σ = (300 - 182)/23 = 5.13

300 is 5.13 Standard deviation from the mean

Probability of scoring 300 points = P(x = 300) = P(z = 5.13)

Using the normal distribution formula which is presented in the attached image to this question,

The mean = μ = 182

Standard deviation = σ = 23

x = variable whose probability is required = 300

P(x = 300) = P(z = 5.13) = 1.449193 × 10⁻⁷

Extremely unlikely!

Hope this helps!!!

Each goat gets 3 carrots.

After giving 3 carrots to each of the goat, 4 carrots are left with Ty in total.

Step-by-step explanation:

Here, the total number of carrots  = 19

The total number of goats  = 5

So, in the given condition:

19 is the DIVIDEND

5 is the DIVISOR

Now, dividing 19 by 5, we get:

19  = 5 x 3 +  4

Here,  3 = Quotient

4 = Remainder

So, by the given equation. we can say that:

Each goat gets 3 carrots.

After giving 3 carrots to each of the goat, 4 carrots are left with Ty in total.

Answer:

The cheapest route to visit each city and return home again to Athens is:

A→B→C→D→A  or A→D→C→B→A.

Step-by-step explanation:

The Algorithm of Brute Force

Let Athens ⇒A , Buford ⇒B , Cuming ⇒ C , Dacula ⇒ D

There are 6 routes to visit each city and return home again to Athens.

Route 1: A→B→C→D→A = 70 + 25 + 30 + 60 = $185

Route 2: A→B→D→C→A = 70 + 70 + 30 + 50 = $220

Route 3: A→C→B→D→A = 50 + 25 + 70 + 60 = $205

Route 4: A→C→D→B→A = 50 + 30 + 70 + 70 = $220

Route 5: A→D→B→C→A = 60 + 70 + 25 + 50 = $205

Route 6: A→D→C→B→A = 60 + 30 + 25 + 70 = $185

By checking the previous routes:

The cheapest charge will be $185 and it will be for the route

A→B→C→D→A  or A→D→C→B→A.

Answer:

The answer to the question is

Its other zero (x-intercept) will be located at x = -5

Step-by-step explanation:

To solve the question, we note that a parabolic function is of the form

ax² + bx +c = 0

Therefore we have the vertex occurring at the extremum  where the slope = 0

or dy/dx =2a+b = 0 also the x intercept occurs at x = 7, therefore when

ax² + bx +c = 0, x = 7 which is one of the solution

when x = 5, y = -4

That is a*25 +5*b + c = -4 also

49*a + 7*b + c = 0

2*a + b = 0

Solving the system of equations we get

a = 0.2, b = -0.4 and c = -7

That is 0.2x² -0.4x -7 = 0 which gives

(x+5)(x-7)×0.2 = 0

Therefore the x intercepts are 7 and -5

the second intercept will be located at x = -5

Final answer:

The other zero of the parabolic function with a vertex at (5, -4), and one zero at x = 7, will be located at x = 3, since it will be symmetrically placed with respect to the vertex.

Explanation:

The vertex of a parabolic function represents the highest or lowest point on the graph, depending on whether the parabola opens upwards or downwards. The fact that the vertex of the function is given as (5, -4) and one zero is at x = 7 leads to the conclusion that the other zero must be equidistant from the vertex on the x-axis because a parabola is symmetric about its vertex. Since the distance from the vertex (5) to the given zero (7) is 2 units to the right, the other zero must be 2 units to the left of the vertex. Therefore, the other zero will be at x = 5 - 2, which is x = 3.

Step-by-step explanation:

[tex]-2x^2+10x=-14\qquad\text{divide both sides by (-2)}\\\\\dfrac{-2x^2}{-2}+\dfrac{10x}{-2}=\dfrac{-14}{-2}\\\\x^2-5x=7\qquad(a-b)^2=a^2-2ab+b^2\qquad(*)\\\\x^2-2(x)(2.5)=7\qquad\text{add}\ 2.5^2\ \text{to both sides}\\\\\underbrace{x^2-2(x)(2.5)+2.5^2}_{(*)}=7+2.5^2\\\\(x-2.5)^2=7+6.25\\\\(x-2.5)^2=13.25[/tex]

[tex]\text{If you want the solution, then:}\\\\(x-2.5)^2=13.25\iff x-2.5=\pm\sqrt{13.25}\\\\x-\dfrac{25}{10}=\pm\sqrt{\dfrac{1325}{100}}\\\\x-\dfrac{25}{10}=\pm\dfrac{\sqrt{1325}}{\sqrt{100}}\\\\x-\dfrac{25}{10}=\pm\dfrac{\sqrt{25\cdot53}}{10}\\\\x-\dfrac{25}{10}=\pm\dfrac{\sqrt{25}\cdot\sqrt{53}}{10}\\\\x-\dfrac{25}{10}=\pm\dfrac{5\sqrt{53}}{10}\\\\x-\dfrac{5}{2}=\pm\dfrac{\sqrt{53}}{2}\qquad\text{add}\ \dfrac{5}{2}\ \text{to both sides}\\\\x=\dfrac{5}{2}\pm\dfrac{\sqrt{53}}{2}[/tex]

[tex]\huge\boxed{x=\dfrac{5\pm\sqrt{53}}{2}}[/tex]

Answer: the ladder should be 25 feet

Step-by-step explanation:

The ladder forms a right angle triangle with the building and the river. The length of the ladder represents the hypotenuse of the right angle triangle. The height from the top of the ladder to the base of the building represents the opposite side of the right angle triangle.

The distance from the bottom of the ladder to the base of the building represents the adjacent side of the right angle triangle.

To determine the length of the required ladder h, we would apply Pythagoras theorem which is expressed as

Hypotenuse² = opposite side² + adjacent side²

h² = 24² + 7² = 576 + 49

h² = 625

h = √625 = 25 feet

Answer:

a represents the Number of Minutes Late, (a=15 in this case)

Step-by-step explanation:

If the daycare charges a base fee of $3 plus $0.50 per minute late for late pickups(after closing time).

Albin on arrival for pickup had to pay $10.50;

She uses the equation

10.50=0.50a+3

0.50a=10.50-3

0.50a=7.50

a=7.50/0.5

a= 15

It means Albin was 15 minutes late to a pickup.

m∠1 = 30° (by Vertical angle theorem)

m∠A = 80° (by Triangle sum theorem)

m∠D = 80° (by Triangle sum theorem)

The value of x is 7.5 and y is 9.

Solution:

∠ACB and ∠DCE are vertically opposite angles.

Vertical angle theorem:

If two lines are intersecting, then vertically opposite angles are congruent.

⇒ m∠DCE = m∠ACB

⇒ m∠1 = 30° (by Vertical angle theorem)

In triangle ACD,

Triangle sum property:

Sum of the interior angles of the triangle = 180°

⇒ m∠A + m∠C + m∠B = 180°

⇒ m∠A + 30° + 70° = 180°

⇒ m∠A + 100° = 180°

⇒ m∠A = 100° – 180°

⇒ m∠A = 80° (by Triangle sum theorem)

Similarly, m∠D = 80° (by Triangle sum theorem)

In ΔACD and ΔDCE,

All the angles are congruent, so ΔACD and ΔDCE are similar triangles.

In similar triangle corresponding sides are in the same ratio.

[tex]$\frac{9}{12}=\frac{x}{10}[/tex]

Do cross multiplication.

90 = 12x

7.5 = x

Now, to find y:

[tex]$\frac{9}{12}=\frac{6}{y}[/tex]

Do cross multiplication.

9y = 72

Divide by 9, we get

y = 8

Hence the value of x is 7.5 and y is 9.

Option A: [tex]\frac{10}{9}[/tex] is the solution of x

Explanation:

The given expression is [tex]\frac{7}{(x+2)}+\frac{11}{(x-5)}=\frac{7}{(x+2)(x-5)}[/tex]

We need to determine the value of x.

The value of x can be determined by solving the expression for x.

Taking LCM , we get,

[tex]\frac{7(x-5)+11(x+2)}{(x+2)(x-5)}=\frac{7}{(x+2)(x-5)}[/tex]

Since, the denominator is common for both sides of the equation, let us cancel the denominator.

Thus, we have,

[tex]7(x-5)+11(x+2)=7[/tex]

Multiplying the terms within the bracket, we get,

[tex]7x-35+11x+22=7[/tex]

Adding the like terms, we get,

[tex]18x-13=7[/tex]

Adding both sides of the equation by 13, we have,

[tex]18x=20[/tex]

Dividing both sides of the equation by 18,

[tex]x=\frac{20}{18}[/tex]

Simplifying, we get,

[tex]x=\frac{10}{9}[/tex]

Thus, the solution is [tex]\frac{10}{9}[/tex]

Therefore, Option A is the correct answer.

Answer:

a

Step-by-step explanation:

Answer:

The actual distance between the two rivers is 232.5 kilometers.

Step-by-step explanation:

GIven:

The scale on a map is 2 centimeters= 50 kilometres.Two rivers on a map are located 9.3 centimeters apart.

Now, to find the actual distance between the two rivers.

Let the actual distance between the two rivers is [tex]x.[/tex]

The two rivers on the map is located apart of 9.3 centimeters.

According to the scale on the map is 2 centimeters = 50 kilometers.

So, 2 centimeters is equivalent to 50 kilometers.

Thus, 9.3 centimeters is equivalent to [tex]x.[/tex]

Now, to solve by using cross multiplication method:

[tex]\frac{2}{50} =\frac{9.3}{x}[/tex]

By cross multiplying we get:

[tex]2x=465[/tex]

Dividing both sides by 2 we get:

[tex]x=232.5\ kilometers.[/tex]

Therefore, the actual distance between the two rivers is 232.5 kilometers.

Answer:

If length of the field is 30 ft, then width is 120 ft.

If the  length of the field is 60 ft, then width is 60 ft.

Step-by-step explanation:

Let us assume the length of the rectangular park = L ft

Let us assume the breadth of the rectangular park = B  ft

Now, AREA of the given park =  L x B

⇒ L x B  = 3,600 sq ft   ... (1)

Also, the perimeter of three sides  = 180 ft

⇒ 2 L +  B  = 180  ..... (2)

Now, from (1) and (2), we get:

L x B  = 3,600

2 L +  B  = 180   ⇒ B  = 180 - 2 L

Substitute this in(1) , we get:

L x B  = 3,600   ⇒ L x (180 - 2 L)  = 3600

[tex]\implies 180 L - 2L^2 = 3600\\\implies L^2 -90L + 1800 = 0\\\implies (L-30)(L-60)= 0[/tex]

⇒ L = 30 or L  = 60

So, if L  = 30  ft , then B = 180 - 2L  =  180 - 60 = 120 ft

So, if L  = 60  ft , then B = 180 - 2L  =  180 - 120 = 60 ft

So, if length of the field is 30 ft, then width is 120 ft.

And if the  length of the field is 60 ft, then width is 60 ft.

Answer:

  (t, h(t)) = (4, 9256)

Step-by-step explanation:

We assume you intend the h(t) function to be ...

  h(t) = -16t^2 +128t +9000

The equation can be written in vertex form as follows:

  h(t) = -16(t^2 -8t) +9000

  h(t) = -16(t^2 -8t +16) +9000 -(-16)(16) . . . . add and subtract -16(16) to complete the square

  h(t) = -16(t -4)^2 +9256 . . . . . vertex form of the height function

The vertex of h(t) is (4, 9256), an altitude of 9256 feet after 4 seconds.

Answer:

Please see attached picture for full solution.

Final answer:

The math and science club scored points by solving problems in a competition, with a total of 8 math problems solved on the first day and 5 science problems on the second day.

Explanation:

The situation from Madison Middle School's math and science club competition can be represented and solved with mathematical equations. Let's break down each part of the problem.

Part A: Equation Representation

Let m be the number of problems solved in the morning, and a the number in the afternoon. The equation representing the total points for the day is: 2m + 3a = Total Points.

Part B: Solving for the Afternoon Session

The team scored 4 points in the morning, meaning they solved 2 problems (as each is worth 2 points). This gives us the equation 2*2 + 3a = 28. Solving this, we find a = 8. Thus, the team solved 8 problems in the afternoon session to finish the day with 28 points.

Part C: Science Portion on the Second Day

On the second day, the team starts with 28 points and ends with 53 points, all from solving science problems worth 5 points each. The equation is 5s + 28 = 53, where s is the number of science problems solved. This simplifies to s = 5, indicating the team solved 5 science problems.

Answer:

since it's a square, all sides are equal

therefore,

3x - 5 = x + 1

2x = 6

x = 3

sub x into AD, which is 3x-5

= 3(3) - 5

= 9 - 5

= 4

therefore AD is 4 units

Step-by-step explanation:

The length of AD in a square ABCD is equal to the length of any other side.

Without specific measurements given for any side, the length of AD cannot be determined.

To find the length of segment AD in a square ABCD, we utilize the properties of a square where all sides are equal.

Therefore, if you know the length of any other side of the square, that would be the length of AD as well.

However, since the length of AB, BC, or CD is not provided in the question, there is insufficient information to determine the length of AD.

Without additional information, such as the length of one of the sides or a relationship that includes AD, it is impossible to provide a numerical answer.

If the question related to the string exercise is part of the information to be used, we would need to know the length of ED or BD to find AD, again, as they are all equal in a square.

For any real-world application like in the trilateration example, measuring actual dimensions would be necessary.

The expression 1.18p can be used to find the total cost of the meal with gratuity.

Step-by-step explanation:

Step 1:

If there are more than 6 people, the restaurant charges an automatic gratuity of 18%.

Since there are 8 people this charge will also be applied here.

If the bill amount is p and 18% of p is added, the options 0.18p and 0.82p cannot be the total cost of the meal.

Step 2:

We need to determine how much 18% is in terms of p.

18% of p [tex]= \frac{18}{100} (p) = 0.18p.[/tex]

So the total cost of the meal = Cost of the meal + Gratuity charges [tex]=p + 0.18p = 1.18p.[/tex]

So the total cost is the third option 1.18p.

Answer:

1.18

Step-by-step explanation:

Answer:

It will travel high enough

Step-by-step explanation:

Find the vertex of the parabola:

x=-b/2a

x=-11/2(-16)

x=-11/-32

x=11/32

Plug x=11/32 into quadratic to get the y-coordinate:

h=-16(11/32)^2+11(11/32)+5.5

h=7.391

Since 7.391>7.3, the volleyball will travel high enough (aka. yes)

To determine if the volleyball clears the net, we calculate the maximum height using the vertex of the parabola from the quadratic equation representing the ball's trajectory. By finding the time at the vertex and substituting it back into the equation, we get the maximum height, which needs to be compared with the net's height.

To determine whether the volleyball travels high enough to clear the net, we need to calculate the maximum height reached by the ball using the given quadratic equation h = −16t2 + 11t + 5.5. The maximum height will be at the vertex of the parabola represented by the quadratic function. The t-coordinate of the vertex can be found using the formula t = -b/2a, where a and b are the coefficients from the quadratic term and the linear term respectively.

For the given equation h = -16t2 + 11t + 5.5, a is -16 and b is 11. Thus,

Doing the calculation will reveal the maximum height of the volleyball. If this height is greater than 7.3 feet, the height of the net, then the volleyball clears the net.

https://brainly.com/question/35544673

#SPJ6

Answer: 3) k = 22.5; xy = 22.5

Step-by-step explanation:

If two variables are inversely proportional, it means that an increase in the value of one variable would cause a corresponding decrease in the other variable. Also, a decrease in the value of one variable would cause a corresponding increase in the other variable.

Given that y varies directly with x, if we introduce a constant of proportionality, k, the expression becomes

y = k/x

If y = 2.5 when x = 9, then

2.5 = k/9

k = 9 × 2.5 = 22.5

Therefore, an equation for the inverse variation is

y = 22.5/x

xy = 22.5

Answer: (3)

k = 22.5; xy = 22.5

Step-by-step explanation:

Answer:

-40x(x+1)

Step-by-step explanation:

Find [g•h](x) and [h•g] (x)

g(x)=2x

h(x)=-10x-10

[g•h](x) = 2x(-10x-10)= -20x^2-20x = -20x(x+1)

[h•g](x) = (-10x-10)2x= -10x(2x)-10(2x) = -20x^2-20x

[g•h](x) and [h•g] (x)

and means addition

-20x^2-20x + (-20x^2-20x)

-20x^2-20x-20x^2-20x

choose like terms

-20x^2-20x^2-20x-20x

-40x^2-40x

-40x(x+1)