19. Evaluate the expression 5a - 4 when a = 2.
a. 9
b. 6
C.4
d. 14
20.Evaluate the expression 2(x - 4) when * = 4
a. 1
b. - 4
c. 4
d. O
21. Which of the following is equal to 5 times the sum of 4 and 3?
a.35
b. 23
C. 19
d. 12
22. What is the sum of (3x + 7y) and (4x + 5y)?
a. 7x + 12y
b. 7x + 2y
c. 7x - 12y
d. 7y - 2x
23. Add: 7x + 3y and 5x - 4y.
a. 13x + y
b. 16x - 5y
c. 12x - y
d. 18x * 3
24. Subtract xy from - xy.
a. 2xy
b. 0
C. - 2xy
d.xy
a. 9
b. 6
C.4
d. 14
20.Evaluate the expression 2(x - 4) when * = 4
a. 1
b. - 4
c. 4
d. O
21. Which of the following is equal to 5 times the sum of 4 and 3?
a.35
b. 23
C. 19
d. 12
22. What is the sum of (3x + 7y) and (4x + 5y)?
a. 7x + 12y
b. 7x + 2y
c. 7x - 12y
d. 7y - 2x
23. Add: 7x + 3y and 5x - 4y.
a. 13x + y
b. 16x - 5y
c. 12x - y
d. 18x * 3
24. Subtract xy from - xy.
a. 2xy
b. 0
C. - 2xy
d.xy
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Answer:
19. b
20. d
21. a
22. a
23. c
24. a
Step-by-step explanation:
19. 5a-4
5(2)-4
10-4
=6
20. 2(x-4)
2(4-4)
2(0)
=0
21. 5(4+3)
5(7)
=35
22.(3x+7y)+(4x+5y)
=7x+12y
23. (7x+3y)+(5x-4y)
=12x-y
24. xy-(-xy)
xy+xy
=2xy