Question

21. What must be added to -9 to have a sum of 20?

a. 9

b. 19

c. 29

d.39

22. What is the difference if -12 is subtracted from 45

a. 33
b. 47
c. 23
d. 57

23. The product of two numbers is -39,483. If one number is 123, what is the other number?

a. -123
b. -321
c. 321
d. -231

24. In a Math contest, every correct answer is worth 3 points, and every wrong answer is worth -2 points. If Ralph answered 30 questions correctly and got 10 wrong answers, what is his total points?

a. 50
b. 60
c. 70
d. 80

25. What is the product of (-2)5?

a. -10

b. 10

c. 32

d. -32


(Pls help me it’s due today :,D)

Answer 1

21) c)29

22) d)57

23) b)-321

24) c)70

25) a)-10

explanation

let the unknown answer be x

21) x+(-9)=20

x-9=20

x=20+9

x=29

22)45-(-12)=x

45+12= 57

23)x×123 = -39483

x= -39483

123

x= -321

24) (30×3)+(-2×10)

90+(-20)

90-20=70

25) 5×-2=-10

Answer 2

21C

22D

23B

24C

25A

Explanation: