quiz 22, 10.1 - 10.15

Question 1

-8 + (-4) =

Answer 1

-12

Question 2

16 + (-9) =

Answer 2

same as 16 - 9 = 7

Question 3

5 - (-6) =

Answer 3

same as 5 + 6 = 11

Question 4

-4(-8) =

Answer 4

32

Question 5

-20/4 =

Answer 5

-5

Question 6

3 to the 4th power =

Answer 6

3 x 3 x 3 x 3 =
9 x 9 =
81

Question 7

The sum of 9 and three times a number is 21. What is the number?

Answer 7

3n + 9 = 21
3n = 12
n = 4

Question 8

Two thirds of a number is 10. What is the number?

Answer 8

2/3n = 10
3/2 * 2/3n = 10 * 3/2
n = 15

Question 9

Five times a number is 40. What is the number?

Answer 9

5n = 40
n = 8