These two questions are not connected.

4a. 7 phones on phone plan

4b. 10 phones

Other Problem: a = dy + cd

Step-by-step explanation:

4a.

1. First make equation: y = 15x+50

2. Plug in Number

155 = 15x + 50

-50                 -50

105 = 15x

15        15

x = 7

4b.

1. Make Equation: 200 greater than or equal to 15x + 50

2. Solve

200 greater than or equal to 15x + 50

-50                                                   -50

150 greater than or equal to 15x

15                                             15

x = 10

Second Question

y = a/d - c

Step 1: Move C to other side

y = a/d - c

+c         +C

y+c = a/d

Step 2: Isolate A (Multiply all by d)

(multipy d to y and c) (d) y+c = a/d (d) (multiply by d to isolate a)

a = dy + cd

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

answer is your mom hey