Igot 5 figured out so far but my brain is pooped. any would be greatly appreciated! in advance.

1. 10ac × 6ab × (–2bc) = ?

a. 2a + 2b +2c – 120
b. 14a2b2c2
c. 2a + 2b + 2c + 14
d. –120a2b2c2

divide 12x4y4 by 3x2y.

a. 9x6
b. 9x2y3
c. 4x6y5
d. 4x2y3

combine the like terms in the expression 6a – 4b – 2a + c – 3b + a.

a. 3a + b + c
b. 8a + b + c
c. 5a – 7b + c
d. 9abc

remove the parentheses from the following expression, and combine like terms: (2x + 3y – 4z) – (x – y – z)

a. x + 4y – 3z
b. x + 2y – 5z
c. 3x + 4y – 3z
d. 3x + 4y + 5z

find the value of (+328.62) – (+98.6).

a. –427.22
b. 427.22
c. 230.02
d. –230.02

remove the parentheses from the following expression: (+6) – (+2)

a. –6 + 3
b. 6 + 2
c. 6 – 2
d. –6 – 2

find the value of (–3/8) × (+8/15).

a. 11/23
b. –1/5
c. –1/3
d. 11/15

10. find the answer to the problem (–5/6) + (–1/12).

a. –4/12, or –1/3
b. –11/12
c. 6/12, or 1/2
d. 9/12, or 3/4

11. what is the value of (1/2)3?

a. 1/6
b. 11/2
c. 1/8
d. 1/2

13. use the correct order of operation to solve the following problem: 3 × (50 – 62) ÷ 2

a. 21
b. 69
c. 18
d. 57

14. (–28)(+16) =

a. –448
b. –44
c. –12
d. –196

15. find the value of (–3/4)(–6/15).

a. –9/19
b. 3/10
c. –3/5
d. 31/3

what is the term a–3 equal to?

a. 1
b. 152a
c. 3a
d. 1/a3

17. find the answer to this problem: (15/16) – (– 3/16)

a. –3/4
b. –11/8
c. 11/8
d. 3/4

18. remove the parentheses from the expression (–2) – (–3).

a. 2 + 3
b. –2 – 3
c. –2 + 3
d. 2 – 3

19. remove the parentheses from the following expression, and combine like terms: (a + b – c) + 3a – 2c

a. 4a + b – 3c
b. 4a + b + 3c
c. 2a – b + c
d. 2a – b – c

20. combine the like terms in this expression: –3x + 2xy + 4y – xy + 2x – 11y

a. 2xy + 15
b. 23x + y
c. –7xy
d. –x+xy–7y

21. multiply (–4.2)(–6.8).

a. 285.6
b. –285.6
c. 28.56
d. –28.56

22. use the correct order of operations to solve the following problem: 6 + (15 × 3) × 2.

a. 126
b. 96
c. 102
d. 84

23. a number line is for

a. visualizing the relationship between positive and negative numbers.
b. multiplying fractions and decimals.
c. raising a number to a certain power.
d. adding and subtracting large signed numbers.

24. perform the following division: (–1/6) ÷ (–3/7)

a. 7/18
b. –3/42
c. 3/42
d. –7/18

25. multiply (–3) by (+1.4).

a. 0.42
b. –4.2
c. –0.42
d. 4.2