The temperature at 12 noon at a certain place was 18° above zero. If it decreases at the rate of 3° per hour at what time it would be 12° below zero?

(a)

12 mid night

(b)

12 noon

(c)

10 am

(d)

10 pm

(-10) + ( +7)=____

(a)

+3

(b)

-3

(c)

-17

(d)

+17

20 + (-9) + (9)

(a)

20

(b)

29

(c)

11

(d)

38

(-100) - 0 + 100 = _____

(a)

200

(b)

0

(c)

100

(d)

-200

Which property is illustrated by the equation:(5 x 2) + (5 x 5) = 5 x (2 + 5)

(a)

commutative

(b)

closure

(c)

distributive

(d)

associative

(-2) x −(-9) =_____

(a)

108

(b)

-108

(c)

+1

(d)

-1

Which of the following does not represent an Integer?

(a)

0 ÷ (-7)

(b)

20 ÷ (−4)

(c)

(-9) ÷ 3

(d)

(12) ÷ 5

(−16) ÷ 4 is the same as

(a)

- (-16 ÷ 4)

(b)

−(16) ÷ (-4)

(c)

16 ÷ (-4)

(d)

−4 ÷ 16

(−200) ÷ 10 is

(a)

20

(b)

-20

(c)

-190

(d)

210

The set of integers is not closed under

(a)

Addition

(b)

Subtraction

(c)

Multiplication

(d)

Division