Joylin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. She knows that the total cost to download 3 videos was $12. Her work to find the equation is shown below. Joylin’s Work Step 1 k = StartFraction 3 over 12 EndFraction = 0.25 Step 2 y = 0.25 x Where did Joylin make her first error Joylin divided 3 and 12 instead of multiplying the two numbers. Joylin computed the decimal equivalent of StartFraction 3 over 12 EndFraction incorrectly. Joylin used 0.25 as the coefficient of x instead of a product of x and y. Joylin switched the numerator and the denominator when she found k.

Answer:

7x - y = 5

Step-by-step explanation:

The equation of a line in standard form is

Ax + By = C ( A is a positive integer and B, C are integers )

Obtain the equation in point- slope form and rearrange into standard form.

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

Here m = 7 and (a, b) = (1, 2)

y - 2 = 7(x - 1) ← in point- slope form

y - 2 = 7x - 7 ( subtract y from both sides )

- 2 = 7x - y - 7 ( add 7 to both sides )

5 = 7x - y , that is

7x - y = 5 ← in standard form

Answer:

c

Step-by-step explanation:

Answer:

30 cm

Step-by-step explanation:

The circumference of a circle is

C = 2*pi*r

60pi = 2* pi *r

Divide each side by 2pi

60/2pi = 2 pi r/ 2pi

30 =r

Answer:

Step-by-step explanation:

circumference , c = 60[tex]\pi[/tex] cm

we know circumference of a circle = 2[tex]\pi[/tex]r

ie  2*[tex]\pi[/tex]*r=60[tex]\pi[/tex]

ie   2r=60

radius = 30cm

hope it helps you..

Answer:

2:5

Step-by-step explanation:

Answer:

x= 141

Step-by-step explanation:

12 squared is 144 so 144 subtracted by 3 is 141 therefore x=141

Answer:

1 1/5

48/40 = 1 8/40

1 8/40 Simplify to 1 1/5

Step-by-step explanation:

Answer:

Step-by-step explanation:

3c + 5w = 16

6c + 2w = 22

-6c - 10w = -32

6c  + 2w = 22

-8w = -10

w = 10/8 = 5/4 = $1.25 per lb

3c + 5(1.25) = 16

3c + 6.25 = 16

3c = 9.75

c = $3.25 per lb

Answer:

x=2 and x=-5

Step-by-step explanation:

factoring the equation

x^2+6x-4-3x-6=0

x^2+3x-10=0

(x-2)(x+5)=0

x=2  and x=-5

Answer:

[tex]f(x)=\left \{ {{29\,\,for \,\,x\,\leq 250 } \atop {29+0.35(x-250)\,\,for \,x>250}} \right.[/tex]

Step-by-step explanation:

If we call "x" the number of call minutes used with this plan, the piecewise function used to describe it must represent;

a) a constant value of 29 for any x value smaller than or equal to 250

b) a line with positive slope of 0.35 for the region with x larger than 250. The mathematical representation of such increasing straight line, should be given by a line of slope m = 0.35, and containing the point (250, 29) which is the starting point for this right hand side portion of the domain:

[tex]f(x)=0.35(x-250)+29\\f(x)=0.35 x-87.5+29\\f(x)=0.35 x-58.5[/tex]

So the function should look like:

[tex]f(x)=\left \{ {{29\,\,for \,\,x\,\leq 250 } \atop {29+0.35(x-250)\,\,for \,x>250}} \right.[/tex]

or as shown above, in a more simplified form:

[tex]f(x)=\left \{ {{29\,\,for \,\,x\,\leq 250 } \atop {0.35x-58.5\,\,\,for \,\,x>250}} \right.[/tex]

Answer:

y+1 = -1(x+10)

Step-by-step explanation:

The point slope equation of a line is

y-y1 = m(x-x1) where m is the slope  and (x1, y1) is a point on the line

y - -1 = -1 (x --10)

y+1 = -1(x+10)

Answer:

My final answer was that it has no solution, I hope that is one of the choices you have for this task.

I hope this help.

Step-by-step explanation:

｡☆✼★ ━━━━━━━━━━━━━━  ☾  

I believe you just multiply all the values together

3 x 3 x 9 = 81

You can make 81 different pizzas

Have A Nice Day ❤    

Stay Brainly! ヅ    

- Ally ✧    

｡☆✼★ ━━━━━━━━━━━━━━  ☾

The number of different pizzas Can I make is 81.

Given that,

Based on the above information, the calculation is as follows:

[tex]= 3\times 3\times 9[/tex]

= 81

Therefore we can conclude that The number of different pizzas Can I make is 81.

Learn more: brainly.com/question/17429689

Answer:

A) Area: 24 cm squared

8 * 3= 24

B) Area: 40.04 cm squared

5.2 * 7.7 = 40.04

Answer:

60

Step-by-step explanation:

3 times 5 times 4

Answer:i think all you have to do is count the cubes

Step-by-step explanation:

KLWHDSFIOwyefhiuhmhdkjhgfuojhjiufghqugiujkqjbehfuigqwwiolefbhioqwghfoihgiubwiugwqbjiu

Answer:

D

Step-by-step explanation:

Its trying something new and that is basically what an experiment is.

Answer:

THE ANSWER IS D

Step-by-step explanation:

A

P

E

X

Answer: $13

Step-by-step explanation:

Answer: $13

Step-by-step explanation:

49-36=13

Answer:

22

Step-by-step explanation:

-15 plus 28 plus 9 equals 22

Answer:

your answer is A.)22

Step-by-step explanation:

first you take -15+28 which means subtracting and you get 13 then you take 13+9 and get 22

Answer:

2.27 m²

Step-by-step explanation:

The shaded area is the subtraction of the area of an equilateral triangle (with sides = 2 m) to the area of a square (with sides = 2 m)

Area of equilateral triangle = √3/4*a²

where a is the length of the sides of the triangle. Replacing with a = 2

Area of the equilateral triangle = √3/4*2² = √3 m²

Area of the square = a² = 2² = 4 m²

Shaded area = 4 - √3 ≈ 2.27 m²

Answer:

a. 720

Step-by-step explanation:

Answer:

720 uhhhhhhhhhhhhhhhhh

Answer:  45 degrees.

Step-by-step explanation:

The middle angle of a right angle is  90 degrees and half of the 90 degrees is 45.

Answer:

Step-by-step explanation:

let the middle angle=x

then

[tex]x+\frac{x}{2}+90=180\\2x+x+180=360\\3x=360-180=180\\x=180/3=60\\\frac{x}{2}=30[/tex]

so angles are 30°,60°,90°

smallest angle=30°

Answer:The answer would be A. 1 1/5

48/40 = 1 8/40

1 8/40 Simplify to 1  1/5

Hope this helps!

Step-by-step explanation:

Answer:

30 ways

Step-by-step explanation:

PEOPLE contains 5 letters

P and E come twice(divide)

5!/2!2!=30 ways

Answer:

Hai

6x=3600

x=600

so tuan collected 600 bottles.

aziz collected 3000 bottles.

5x(aziz)+x(tuan)=3600

good luck (:

Answer:

Step-by-step explanation:

Let x represent the number of bottles Tuan collected. Then 5x is the number Aziz collected. Their total is ...

  x +5x = 3600

  6x = 3600 . . . . . . collect terms

  x = 3600 ÷ 6

  x = 600

Tuan collected 600 bottles.

Answer:

A, E and F

Step-by-step explanation:

All three of them equal root 5.

Answer:

The distance formula

Step-by-step explanation:

This was kind of vague, but I'll try my best.

You can use the distance formula! It is basically the pythagorean theorem.

Here's the steps,

1. draw a right triangle from the corners. If you have graph paper, this should be relatively easy.

2. locate the hypotenuse, that is the distance.

3. next use the pythagorean theorem/ distance formula (same thing)

4. Except, instead of a and b and c, replace them with

(Change in x)²+(change in y)²= distance²

Now plug in the values

Now you're done!

Answer:

Step-by-step explanation:

[tex]F\left[X] = 5X +7X -2 =12X-2\\[/tex]

[tex]g\left[x] = -2x^2+4x+5 \\[/tex]

[tex]f(x) - g(x) \\= 12x -2 - ( -2x^2+4x+5)\\=12x-2+2x^2-4x-5\\=2x^2 + 8x -7[/tex]

Answer:

2x^2+8x-7

Step-by-step explanation:

Combine like terms 5x+7x in your f(x) equation.  

f(x) = 12x-2 then subtract g(x) from f(x).

12x-2-(-2x^2+4x+5)

Now distribute the negative to everything in the parenthses to change the signs.

12x-2+2x^2-4x-5.

Now, combine like terms.  12x-4x=8x

Combine -2-5=-7

Next, order expression beginning with largest exponent:

Your answer:  2x^2+8x-7.

Answer:

5% chance

Step-by-step explanation:

At first there is a one in 5 percent chance you get math. So thats a 20% chance. Now you have a 1 in 4 chance of getting history. Find a GCF (5) and combine you 5/20 chance and your 4/20 chance to get 5% chance!

Answer:

Rhombus

Step-by-step explanation:

In a rhombus, all sides are equal and opposite sides are parallel. Opposite angles are equal.

The shape given in the figure describes Rhombus.

We have given a diagram

We have to find the correct option.

The Rhombus is a quadrilateral with equal sides.

Since opposite sides of a parallelogram are equal so,the rhombus is a special type of a parallelogram whose all sides are equal.

In a rhombus, all sides are equal and opposite sides are parallel. Opposite angles are equal.

Therefore the correct option is C.

The shape given in the figure describes Rhombus.

To learn more about the Rhombus visit:

https://brainly.com/question/20627264

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