Question

Step problems please

Answer 1

7. $14

8. 5.8 hours

9. 60

10. 24 books

Answer 2

Answer:

Step-by-step explanation:

7. Let the price of book be x

:- 8x + 17 = 129

8x = 129 - 17

8x = 112

x = 112/8

x = $14

Each book cost $14

8. Let the number of hours be x

9x + 15 = 87

9x = 87 - 15

9x = 72

x = 72/9

x = 8hrs

He paid for 8hours

9. Let the numbers be x, x +2, x +4,

So. x + x + 2 + x + 4 = 168

3x + 6 = 168

3x = 168 - 6

3x = 162

x = 162/3

x = 54

The smallest number is 54

10. Let the number of books be x

So, x/2 + 6 = 18

x/2 = 18 - 6

x/2 = 12

x = 12 ×2

x = 24

So she has 24 book's before