There are 325 children at the zoo . If 64% of children are boys and the
rest are girls, how many children at the zoo are girls?

The probability that a randomly selected light bulb will last between 750 and 825 hours is 34.13%. This is calculated through standardization of the desired range into z-scores, and reference to the standard normal distribution table.

The question is about finding the probability that a randomly selected light bulb will last between 750 and 825 hours, given that the life of light bulbs is normally distributed with a mean of 750 hours and a standard deviation of 75 hours.

Firstly, standardize the desired range by subtracting the mean and dividing by the standard deviation. This will give us the z-score: Z = (X - μ) / σ. For X = 750, Z1 = (750 - 750) / 75 = 0. For X = 825, Z2 = (825 - 750) / 75 = 1.

We can then use the Z-table or standard normal distribution table to find the probability associated with these z-scores. Since the z-score for 750 is 0, the probability is 0.5 (or 50%, as it's the mean). For z=1, the probability is 0.8413 (or 84.13%).

The probability that the bulb will last between 750 and 825 hours is then calculated by subtracting the smaller probability from the larger one: 0.8413 - 0.5 = 0.3413 or 34.13%

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To find the probability, calculate the z-scores for the values and use the standard normal distribution table which is 34.13%

To find the probability that a randomly selected light bulb will last between 750 and 825 hours, we need to calculate the z-scores for both values and then use the standard normal distribution table. The z-score is calculated using the formula:

z = (x - μ) / σ

where x is the value, μ is the mean, and σ is the standard deviation. For 750 hours, the z-score is 0, and for 825 hours, the z-score is (825 - 750) / 75 = 1.

Using the standard normal distribution table, the probability corresponding to a z-score of 0 is 0.5, and the probability corresponding to a z-score of 1 is 0.8413.

Therefore, the probability that a randomly selected light bulb will last between 750 and 825 hours is 0.8413 - 0.5 = 0.3413, or 34.13%.

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Answer:

a: x=16 y=8

b. x=6 y=28

Step-by-step explanation:

[tex]\left\{\begin{array}{ccc}9x-8y=2\\-3x-9y=-24&\text{multiply both sides by 3}\end{array}\right\\\underline{+\left\{\begin{array}{ccc}9x-8y=2\\-9x-27y=-72\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad-35y=-70\qquad\text{divide both sides by (-35)}\\.\qquad\qquad\boxed{y=2}\\\\\text{Put the value of y to the second equation}:\\\\-3x-9(2)=-24\\-3x-18=-24\qquad\text{add 18 to both sides}\\-3x=-6\qquad\text{divide both sides by (-3)}\\\boxed{x=2}\\\\Answer:\ \boxed{x=2}[/tex]

Answer:

x coordinate is 2

Step-by-step explanation:

We have given,

9x - 8y = 2   .........(1)

-3x - 9y = -24   ...............(2)

We use elimination method to eliminate y.

We multiply equation (1) by 9 and equation (2) by 8.

We get,

{ 9x - 8y = 2} × 9   or  81x - 72y = 18    -------------(3)

{-3x - 9y = - 24} × 8  or -24x - 72y = -192  -----------(4)

And subtract equation (4) from equation (3)

So , (81x - 72y ) - (-24x -72y)= 18 -(-192)

or 105x = 210

or x = 210/105

or x= 2

Hence we get x coordinate as x= 2

Answer:

48 pages

Step-by-step explanation:

So Colton's rate of using pages is:

9 pages/3 hours = 3 pages per hour.

Thus, we can find out how many pages he uses after 16 hours by multiplying

3 pages × 16 hours, which equals to 48 pages of notes.

Hope this helps!

Answer:

15 points vertically.

Step-by-step explanation:

change -8 to 8, then add the 2 numbers in the y axis and you will get 15. brainliest?

Answer:

2072.56

Step-by-step explanation:

a=1030(1+0.06)^12

Answer:

$2072.60

Step-by-step explanation:

Every year you add on 6% so the multiplier  will be 1.06

so start off:

1030 x 1.06 = 1091.8

1091.8 x 1.06 = 1157.308

.......... you repeat this 12 times for every year and the final answer is

2072.6562366

you take that answer and round it to 2072.60

Hope this helps :)  

Rounded to the nearest tenth, the unit rate of calories per serving is approximately 141.3 calories.

To find the unit rate of calories per serving, divide the total calories (424) by the number of servings (3).

The unit rate is the amount of calories per serving. To find the unit rate, divide the total number of calories by the number of servings:

Unit rate = Total calories / Number of servings

Unit rate = 424 calories / 3 servings

Dividing 424 calories by 3 servings gives:

Unit rate = 424 / 3 ≈ 141.3 calories per serving

So, the unit rate of calories per serving is approximately 141.0 calories rounded to the nearest tenth or approximately 141.00 calories rounded to the nearest cent.

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Answer:

As x decreases without bound, f(x) approaches the line y=3 .

As x increases without bound, f(x) increases without bound.

Step-by-step explanation:

From the given graph f(x), we can see that

When x  increases the value of y also increases

When x decreases  the y values goes close to 3 but it does not cross 3

As x goes to positive infinity , y approaches positive infinity

As x increases without bound, f(x) increases without bound.

As x goes to negative infinity, y values approaches +3

As x decreases without bound, f(x) approaches the line y=3

As x decreases without bound, f(x) approaches the line y=3 . As x increases without bound, f(x) increases without bound. Therefore, options A and B are correct answers.

The given function is f(x)=4 1/3x+3.

Functions are the fundamental part of the calculus in mathematics. The functions are the special types of relations. A function in math is visualized as a rule, which gives a unique output for every input x.

From the given graph f(x), we can see that

When x increases the value of y also increases

When x decreases the y values goes close to 3 but it does not cross 3

As x goes to positive infinity, y approaches positive infinity

As x increases without bound, f(x) increases without bound.

As x goes to negative infinity, y values approaches +3

As x decreases without bound, f(x) approaches the line y=3

Therefore, options A and B are correct answers.

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Answer:

a. opens: downward

b. vertex: (4, 2)

c. x-intercepts: (2, 0), (6, 0); y-intercept: (0, -6)

d. a.o.s.: x = 4

Step-by-step explanation:

Based on the picture the parabola opens downwards. Right away you know that the "a" value in the parabola's equation will be negative.

To find the coordinates of the vertex, you'll need to look at the picture. Remember: look on the x-axis first and then the y-axis next.

The very top of the parabola (maximum point = vertex) is at the x-value of 4 and the y-value of 2. This means the coordinates of the vertex of this parabola is (4, 2).

To find the x-intercepts, look at the x-axis and see where the parabola crosses it. The parabola goes through the x-axis at the x-values of 2 and 6, so the x-intercepts of this parabola are (2, 0) and (6, 0).

To find the y-intercept, look at the y-axis and see where the parabola crosses it. The parabola intersects the y-axis at the y-value of -6, so (0, -6) would be the y-intercept.

The equation for the axis of symmetry of a graph is always x = h, where h is the x-value of the coordinate of the vertex.

Since the vertex is (4, 2), where 4 = h, the equation of the axis of symmetry would be x = 4.

Answer:

The answer is true

Step-by-step explanation:

Answer:

true

Step-by-step explanation:

Answer:

10 & 14

Step-by-step explanation:

10 + 14 = 24

14 - 10 = 4

Answer:

She will owe $500

Step-by-step explanation:

Answer:

She will owe $500 after 4 payments.

Step-by-step explanation:

With the help of graph

Number of payments (x)      Balance remaining(y)

         0                                         2500

         1                                          2000

         2                                         1500

Since it is linear function .

So, we will use two point slope form to find the equation for the given situation.

[tex]y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)[/tex]   ----A

[tex](x_1,y_1)=(0,2500)[/tex]

[tex](x_2,y_2)=(1,2000)[/tex]

Substitute the values in A

[tex]y-2500=\frac{2000-2500}{1-0}(x-0)[/tex]

[tex]y-2500=-500x[/tex]

[tex]y=-500x+2500[/tex]

Where x is the number of payments

y is the remaining payment

This equation represents the given situation.

So, to find the amount remaining after 4 payments .Substitute x =4

[tex]y=-500(4)+2500[/tex]

[tex]y=-2000+2500[/tex]

[tex]y=500[/tex]

Hence she will owe $500 after 4 payments.

Answer:

Interest for 1 year is $80.50

Step-by-step explanation:

Simple interest is given by the formula

I =PRT

where I is the interest, P is the principal, R is the rate in decimal form, and T is the time.

P =3500

R=.023

T = 1     (1 year)

I = (3500) * (.023) (1)

I = 80.50

The dilation of ΔABC by a scale factor of 0.25 maps B to B' and C to C'. Using the distance formula, we find that the length of B'C' is 5 units.

The problem is essentially asking for the length of line segment B'C' in the dilated triangle ΔA'B'C'. When an object undergoes a dilation by scale factor of 0.25, this means that every point x, y is mapped to 0.25x, 0.25y. So points B and C map to B' and C' as follows:

B(2, 1) --> B'(2*0.25, 1*0.25) = B'(0.5, 0.25)
C(14, 17) --> C'(14*0.25, 17*0.25) = C'(3.5, 4.25).

The length B'C' then equals the distance between B' and C', which can be found using the distance formula [tex]\sqrt{{(x_2 - x_1)^2 + (y_2 - y_1)^2}}[/tex]. So the calculation is [tex]\sqrt{(3.5 - 0.5)^2 + (4.25 - 0.25)^2} = \sqrt{3^2 + 4^2} = \sqrt{25} = 5 \text{ units}[/tex].

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Answer:

(-6,-14)

Step-by-step explanation:

[tex]\text{Domain}\\\\y-9 > 0\to y>9\\\\------------------------\\\\\log_4(y-9)+\log_43=\log_481\qquad\text{use}\ \log x+\log y=\log(xy)\\\\\log_4[3(y-9)]=\log_481\qquad\text{use distributive property}\\\\\log_4(3y-27)=\log_481\iff3y-27=81\qquad\text{add 27 to both sides}\\\\3y=108\qquad\text{divide both sides by 3}\\\\\boxed{y=36}\in D\\\\Answer:\ \boxed{y=36}[/tex]

Answer:

y = 36

Step-by-step explanation:

log4 (y – 9) + log4 3 = log4 81.

We know from the property of logs that if the bases are the same, when we subtract logs, we can divide what is inside

loga (b) + loga (b) = loga (b*c)

Lets simplify the expression log4( (y-9)*3) = log4 (81)

Since the bases are the same, what is inside the parentheses on the left hand side  must be equal to what is inside the parentheses o the right hand side

(y-9)*3 = 81

Divide each side by 3

(y-9)*3 /3= 81/3

y-9 = 27

Add 9 to each side

y-9+9 = 27+9

y = 36

I am a butterfly! Look at my wings! Lol.

Anyways. 8*4=32

5*4=20

Leila made $20

-TheOneandOnly003

Answer:

[tex]f(x-1)=-3x+10[/tex]

Step-by-step explanation:

Substitute [tex]x-1[/tex] instead of [tex]x[/tex] into the function expression:

if [tex]f(x)=-3x+7,[/tex] then

[tex]f(x-1)=-3(x-1)+7=-3x+3+7=-3x+10.[/tex]

You get the expression [tex]f(x-1)=-3x+10.[/tex]

The required values of x and y is 9 and -36, respectively. The correct answer is option a.

Given that the system of equations:

y = -3x - 9                       (1)

y = (1/3)x - 39                  (2)

Setting the two equations equal to each other since they both equal y:

-3x - 9 = (1/3)x - 39

⇒ -3(3x) - 3(9) = (1/3)(3x) - 39(3)

⇒ -9x - 27 = x - 117

⇒ -9x - x = -117 + 27

⇒ -10x = -90

⇒ x = -90 / -10

⇒ x = 9

Substitute the value of x back in the equation (1),

y = -3(9) - 9

⇒ y = -27 - 9

⇒ y = -36

Hence, the solution to the system of equations is x = 9 and y = -36. The correct answer is option a.

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Hi, so your answer is the second one

Answer:

P₂ - P₁ = -11 100

Step-by-step explanation:

The profit for month 1 was P₁.

The profit for month 2 was P₂.

The difference in profit was

Diff. = P₂ - P₁

P₁ = 6400; P₂ = -4700

Diff. = - 4700 - 6400

Diff. =  -11 100

Answer:

The angle 6 measures 54 degrees

Step-by-step explanation:

Angle 6 is congruent to angle 7 ("-2x+34") as it is an opposite angle in straight line intersection. But angle 6 is congruent to angle 2 (-9x-36) due to the two horizontal lines being parallel. So we can write the following equality to determine the value of x:

-2x + 34 = -9x -36

7x = -70

==> x = -10

Now we can answer the question:  the angle 6 is

-2x + 34 = -2(-10)+34 = 54 degrees

Answer:

Step-by-step explanation:

Plz mark it as brainliest

[tex]\bf (\stackrel{x_1}{0}~,~\stackrel{y_1}{7})~\hspace{10em} slope = m\implies -\cfrac{4}{5} \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-7=-\cfrac{4}{5}(x-0) \\\\\\ y-7=-\cfrac{4}{5}x\implies y=-\cfrac{4}{5}x+7[/tex]

Final answer:

The man originally had $99. We determined this by setting up an equation based on the remaining amount after spending and misplacing portions of his money, then we solved for the original total.

Explanation:

To solve for the original amount of money the man had, let's call that amount x. First, he spent two-thirds of his money, which is (2/3)x. The remainder is x - (2/3)x = (1/3)x. He then misplaced one-third of this remainder which is (1/3) of (1/3)x = (1/9)x. So the portion he was left with is (1/3)x - (1/9)x = (2/9)x.

Since we know the final amount left is $22, we can express this as an equation:

To find x, we will divide both sides of the equation by (2/9):

When dividing by a fraction, we multiply by its reciprocal which is (9/2):

Therefore, the man originally had $99.

Answer:

9/20

Step-by-step explanation:

1/3 *  3/5 * 2 1/4 =

1/3 * 3/5 * 9/4=

1/5 * 9/4 =

9/20

Answer:

[tex]\frac{9}{20}[/tex]

Step-by-step explanation:

change the mixed number to an improper fraction

2 [tex]\frac{1}{4}[/tex] = [tex]\frac{9}{4}[/tex]

We have to calculate

[tex]\frac{1}{3}[/tex] × [tex]\frac{3}{5}[/tex] × [tex]\frac{9}{4}[/tex]

simplify by cancelling the 3's on the numerator/denominator

then

= 1 × [tex]\frac{1}{5}[/tex] × [tex]\frac{9}{4}[/tex]

multiply the remaining values on the numerators /denominators

= [tex]\frac{9}{5(4)}[/tex] = [tex]\frac{9}{20}[/tex]

Answer:

21.46 or 21.5

Step-by-step explanation:

To find the answer to this problem you must divide 877 by 4132, which gets you 0.2146. Then you multiply this answer by 100 to find the percentage; which in this case is 21.46, or 21.5 if you are rounding up. I hope my answer helped you!

887 is 21.47% of 4132, found by dividing 887 by 4132 and multiplying by 100.

To find out what percent 887 is of 4132, you need to use the formula for calculating percentages, which involves dividing the part by the whole and then multiplying the result by 100.

Here is how you can compute it step-by-step:

Divide 887 by 4132, which gives you approximately 0.2147.

Multiply this result by 100 to convert it into a percentage: 0.2147 * 100 = 21.47%.

Therefore, 887 is 21.47% of 4132.

Answer:

Simplifying the expression eliminating the parentheses:

(-5 u^2 w)^3 = -125 u^6 w^3

Step-by-step explanation:

(-5 u^2 w)^3 = (-5)^3 (u^2)^3 (w)^3

(-5 u^2 w)^3 = (-5)(-5)(-5) u^(2 x 3) w^3

(-5 u^2 w)^3 = -125 u^6 w^3