Charles signs up for cell phone plan a. the starting fee is $20 and she pays $15 each month. sam signs up for plan b. the starting fee is $50 and he pays $10 a month. after how many months do the 2 plans cost the same amount ?

Lets turn the information into expressions

Plan A:

15x + 20

Plan B:

10x + 50

To find when they would both cost the same amount, solve the expressions together:

15x + 20 = 10x + 50

Subtract 10x from both sides

5x + 20 = 50

Subtract 20 from both sides

5x = 30

Divide both sides by 5

x = 6

This means that they'll be the same price after 6 months.

6 months

a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a