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

the answer is 62

not enough information

step-by-step explanation:

we cannot know this, because the other students could have handed out 10 flyers, or they could have handed out 100. one way, the mean would go up, and another way, the mean would go down.