7. Choose an appropriate variable for each situation. Then write and solve an equation.
a. If I doubled the money in my savings account, I would have $150.62.

b. three times the hourly wage plus $7.65 in tips equals $27.90

See explanation

Step-by-step explanation:

a. Let the money in m savings account be represented by x.

If I doubled the money in my savings account, I would have $150.62. This means that:

(2 × x) = $150.62

2x = $150.62

Divide both side by x

2x/2 = $150.62/2

x = $75.31

The amount in the savings account is $75.31

b. Let the hourly wage be represented by x.

Three times the hourly wage plus $7.65 in tips equals $27.90. This will be:

(3 × x) + 7.65 = 27.90

3x + 7.65 = 27.90

3x = 27.90 - 7.65

3x = 20.25

x = 20.25/3

x = 6.75

The hourly wage is $6.75

answer is a

step-by-step explanation:

d

step-by-step explanation:

d