Brian sold half of his baseball cards. The next day, he bought 10 more. Now he has a total of 50 cards. Write and solve an equation to determine how many baseball cards he had before he sold any. Let b represent the number of baseball cards he had.

Answer:

The constant of variation for this relation is k = 5

Step-by-step explanation:

Step:1

given 'y' varies directly as x that is [tex]y \alpha x[/tex]  

[tex]y = kx[/tex]   where k is constant ........(1)

Given y value is 20 and x value is 4

now substitute x = 4 and y=20 in equation (1)

we get solution, 20 = k (4)

dividing '4' on both sides, we get

k = 5

verification:-

y = k x

put k= 5 , y=20 and x= 4

20 = 20

Answer: = 4 + 0.5b i think

Answer: The difference between a number and five is negative 2

Step-by-step explanation:

Answer:

The difference between a number and five is negative 2.

Step-by-step explanation:

~King from 7 deadly sins~

Answer:

Volume of a cone [tex]=942.86cm^3[/tex]

Step-by-step explanation:

Given that the radius of a cone is 15cm and its height is 4cm

That is r=15cm and h=4cm

To find the volume of a cone :

volume of a cone[tex]=\frac{\pi r^2h}{3}[/tex] cubic units

Now substitute the values in the formula we get

volume of a cone[tex]=\frac{(\frac{22}{7}) (15)^2(4)}{3}[/tex]  

[tex]=\frac{(\frac{22}{7}) (225)(4)}{3}[/tex]

[tex]=\frac{19800}{21}[/tex]

[tex]=942.857[/tex]

Now round to nearest hundredth

[tex]=942.86[/tex]

Therefore Volume of a cone[tex]=942.86cm^3[/tex]

Answer:

Step-by-step explanation:

2(x + 2)/3 = 6

multiply by : 3

2(x + 2) = 18

2x+4 = 18

2x = 18-4=14

x=14/2

x=7

Answer:

See below.

Step-by-step explanation:

There is an infinite number of lines parallel to y = -3/2x - 1.

They have the same slope, -3/2, and a different y-intercept.

Examples:

y = -3/2x + 1

y = -3/2x

y = -3/2x - 5

Answer:

the 2nd one

Step-by-step explanation:

Answer:

its D in edge

Step-by-step explanation:

Answer:

This is true

Step-by-step explanation:

When looking at x itself it is just ONE x. 1x=x, the 1x isn't necessary to have so it is shown as x. So looking at x/3 you could say it is also 1x/3 which would still be the same if it were 1/3x. Both would still be considered one-third OF x.

The answer is "[tex]3x=3x[/tex]"

Equating:

[tex]\to \frac{x}{3} = \frac{1}{3}x\\\\x=?[/tex]

Cross multiplying the given expression:

[tex]\to \frac{x}{3} = \frac{1}{3}x\\\\\to 3x=3x[/tex]

Therefore, the given statement is "True"

Find out the more information about the equivalent here:

brainly.com/question/4348710

Answer:8/77

Step-by-step explanation:

Answer: 8/77

Step-by-step explanation:

2/7 divided by 11/4 = 2/7 x 4/11

2/7 x 4/11 = 8/77

Answer:

see attached picture please

STEPS:

1. Start my distributing through the parentheses on each side

of the equation to get 3m + 21 = 6m + 12.

2. Now move your m's to the right and numbers to the left

and you get 9 = 3m.

3. Divide both sides by 3 and 3 = m.

Work is attached.

Answer:

Reflection in the x-axis followed by a translation 5 units left and 1 unit up

Step-by-step explanation:

The coordinates of X are (-6,2).

When we reflect in the x-axis we get X'=(-6,-2)

When we translate by the rule T(x-5,y+1), we get X"=(-6-5,-2+1)=(-11,-1)

The coordinates of Y are (-4,7).

When we reflect in the x-axis we get Y'=(-4,-7)

When we translate by the rule T(x-5,y+1), we get Y"=(-4-5,-7+1)=(-9,-6)

The coordinates of Z are (-2,2).

When we reflect in the x-axis we get Z'=(-2,-2)

When we translate by the rule T(x-5,y+1), we get Z"=(-2-5,-2+1)=(-7,-1)

Therefore the sequence of transformation is a reflection in the x-axis followed by a translation 5 units left and 1 unit up.

Answer:

According to my calculations, the missing number is 11/4

Step-by-step explanation:

Answer:

Step-by-step explanation:

God what grade are u in

Answer:

Step-by-step explanation:

It’s positive

-16

$3.85 per gallon

Answer:

a=24

Step-by-step explanation:

a+(-7)=-17

a+(-7)(+7)=-17+7

a=24

Answer: 12.5

Step-by-step explanation:

As y=x has a slope of 1, it will intersect the line x = 5 at a value of 5, creating an isocoles right triangle with leg length 5. The area of a triangle = (b*h)/2. (5*5)/2 = 12.5 square units

To find the area of the triangle enclosed by the lines y = x and x = a when a = 5, we need to determine the coordinates of the vertices of the triangle. The vertices are (0, 0), (5, 0), and (5, 5). Using the coordinates, we can find the base and height of the triangle and then apply the formula for the area of a triangle.

To find the area of the triangle enclosed by the lines y = x and x = a, where a = 5, we need to determine the coordinates of the vertices of the triangle. The vertices will be the points where the lines intersect the axes. For y = x, the vertex is (0, 0), and for x = a, the vertex is (5, 0). The third vertex will be the point where these two lines intersect, which can be found by substituting the value of a into the other equation. So, when a = 5, the third vertex is (5, 5).

We can now use the coordinates of the vertices to find the base and height of the triangle. The base is the distance between the points (0, 0) and (5, 0), which is 5 units. The height is the distance between the points (5, 0) and (5, 5), which is also 5 units.

The formula for the area of a triangle is (1/2) × base × height. Substituting the values, we have (1/2)× 5 × 5 = 12.5 square units. Therefore, the area of the triangle when a = 5 is 12.5.

https://brainly.com/question/34545343

#SPJ2

Option 1: 6a = 420 requires division property of equality to be solved

Step-by-step explanation:

Solving an equation means to find the value of a variable by isolating the variable on one side of the equation.

We will see all the options one by one.

Option 1:

[tex]6a = 420[/tex]

In this option, 6 is multiplied with the variable so we have to divide the whole equation by 6 to find the value of a.

So we will use "Division property of Equality"

Dividing both sides by 6

[tex]\frac{6a}{6} = \frac{420}{6}\\a=70[/tex]

Hence,

Option 1: 6a = 420 requires division property of equality to be solved

Keywords: Linear equation, variables

Learn more about linear equations at:

#LearnwithBrainly

Answer:

6a = 420

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

Answer:

the answer is the third one

Answer:

The answer is 2,3,4 and ,6

Step-by-step explanation:

This is because 12,24,and 36 can all be divided by 2,,3,,4, and 6

The value of x is -4.186

Solution:

Given equations,

[tex]-3x-8y=20\rightarrow(1)[/tex]

[tex]-5x+y=20\rightarrow+y=20+5x\rightarrow (2)[/tex]

On substituting (2) in (1) we get,

-3x-8(20+5x)=20

-3x-160-40x=20

On solving we get,

-160-43x=20

-43x=20+160

On grouping the known and unknown terms,

x=180/-43

x=-4.1860

Answer:

Step-by-step explanation:

first if you reflect an image its still identical think of it  as a  mirror its the same  but on the other side. so if you  flip it over the x or y axis it would  just be  as if you  folded the paper and shape is on the other side.                                                a rotation would be as if you moved the shape to another quadrant so if you move it 90 degres to the left  it would be  be turned  slightly and a transformation if you slide it up the image is however many  space it was from its current location. so each one moves it from its current location

Answer:Even if you mirror an image, it remains the same. Imagine it as a mirror with the same thing on the opposite side. Therefore, if you turned it over on the x or y axis, the shape would be on the other side just like if you had folded the paper. A transformation would be like sliding the object up however many spaces it was from its current location. For example, if you moved the shape 90 degrees to the left, it would be turned somewhat. A rotation would be like moving the shape to another quadrant. so they all relocate it from their current positions.

Step-by-step explanation:

Answer:

A two-dimensional slice of a three-dimensional solid is called a cross section. Rectangular prisms have the unique property that a perpendicular cross section (a slice of the prism at a 90-degree angle) always creates a rectangle, no matter where on the prism the cross section is taken.

There are three different types of cross sections of a rectangular prism: x-axis, y-axis and z-axis cross sections, corresponding to slices along one of the three dimensions of space. The sum of these three cross sections is equal to half the surface area of the prism.

Different shapes are formed when a rectangular prism is sliced at different angles due to the way the cut intersects the prism's dimensions. For instance, if you cut diagonally or at an angle, the resulting face could be a parallelogram or even a triangle.

When a rectangular prism is sliced at an angle, a variety of shapes can form because of the geometry and dimensions of the prism. Imagine a simple rectangular prism, like a cube. If you slice it horizontally or vertically, you’ll simply create smaller rectangles or squares. However, if you cut diagonally or at an angle, the resulting face could be a parallelogram or even a triangle, depending on how the cut is made. This is a result of changing the orientation of the cut relative to the prism's structure. So, the variety of shapes come as a result of the way the cut intersects the prism's dimensions.

https://brainly.com/question/31670054

#SPJ2

The right answer is Option D.

Step-by-step explanation:

Given,

Retail price = $12,720

Destination charge = $460

Cruise control = $235

Defogger = $148

AM/FM radio = $153

Sticker price = Sum of all feature costs

Sticker price = 12720+460+235+148+153

Sticker price = $13716

The right answer is Option D.

Keywords: addition

Learn more about addition at:

#LearnwithBrainly

Final answer:

To find the vehicle's sticker price, add the suggested retail price to the destination charge and the costs of additional features, resulting in a total of $13,716.

Explanation:

The question involves calculating the total sticker price for a vehicle by adding up various costs. We start with the suggested retail price, then include the destination charge and the costs of the additional features such as cruise control, defogger, and an AM/FM radio.

To find the total sticker price, we simply add all of these amounts together:

Sticker Price = Suggested Retail Price + Destination Charge + Cost of Cruise Control + Cost of Defogger + Cost of AM/FM Radio

Sticker Price = $12,720 + $460 + $235 + $148 + $153 = $13,716

Therefore, the correct answer is d. $13,716.

142 sodas and 71 hot dogs are sold

Solution:

Let "a" be the number of sodas sold

Let "b" be the number of hot dogs sold

At a football game, a vender sold a combined total of 213 sodas and hot dogs

Therefore,

number of sodas sold + number of hot dogs sold = 213

a + b = 213 ------------ eqn 1

The number of sodas sold was two times the number of hot dogs sold

Number of sodas sold = two times the number of hot dogs sold

a = 2b ---------- eqn 2

Let us solve eqn 1 and eqn 2

Substitute eqn 2 in eqn 1

2b + b = 213

3b = 213

b = 71

Substitute b = 71 in eqn 2

a = 2(71)

a = 142

Thus 142 sodas and 71 hot dogs are sold

Option A) when y=6 and w= 2, Option B) when y=4 and w=-1 are the TWO correct choices.

Step-by-step explanation:

The given inequality is w<x<y and x>2.

step 1: let us assume that x=3, since it is given that x>2.

step 2: substitute the value of x=3 and each options in the inequality

step 3: option A) w=2, y=6. Then w<x<y = 2<3<6 (the condition satisfies).

            option B) w= -1, y=4. Then w<x<y = -1<3<4 (the condition satisfies).

            option C) w= 0, y=2. then w<x<y ≠ 0<2<2 (does not satisfies).

            option D) w= -2, y=0. then w<x<y ≠ -2<2<0 (does not satisfies).

            option E) w= -4, y= -1. then w<x<y ≠ -4<2<-1 (does not satisfies).

Answer:

242

Step-by-step explanation:

11x22=242

Answer:

10

Step-by-step explanation:

Out of the ten cards she has ten chances to pick each one

The total number of possible outcomes will be 20.

Random sampling is the method of selecting the subset from the set to make a statical inference.

Carmen has a deck of cards numbered 1-10. She picks one card and flips a coin.

Then the total number of samples is calculated as,

Total sample = 10 x 2

Total sample = 20

The samples are given below.

(1, H), (2, H), (3, H), (4, H), (5, H), (6, H), (7, H), (8, H), (9, H), (10, H)

(1, T), (2, T), (3, T), (4, T), (5, T), (6, T), (7, T), (8, T), (9, T), (10, T),

The total number of possible outcomes will be 20.

More about the sample method link is given below.

https://brainly.com/question/15125943

#SPJ3

Final answer:

The hockey player must score 20 goals to make the same money as the first contract.

Explanation:

In order to make the same amount of money as the first contract, the hockey player must calculate the number of goals required. Let's assume the player needs to score 'x' goals.

For the first contract, the total salary would be 50000 + 1000x. For the second contract, the total salary would be 40000 + 1500x.

Equating the two salaries, we get:

50000 + 1000x = 40000 + 1500x

Subtracting 1000x from both sides, we get:

50000 = 40000 + 500x

Subtracting 40000 from both sides, we get:

10000 = 500x

Dividing both sides by 500, we get:

x = 20

So, in order to make the same money as the first contract, the player must score 20 goals.