3. Evaluate each expression. (total 6 marks: half mark for showing steps, half for correct answer.) a) 7x when x=4 b) 9-2y when y=3 c) 5x+8 when x=9 e) 2r -21 when r=15 f) 3-4y when y=5 f) w+20 when w=4

a) 28

b) 3

c) 53

e) 9

f) -17

f) 24

Step by Step Explanation:

a) 7(4)= 28

b) 9-2(3)= 9-6= 3

c) 5(9)+8= 45+8= 53

e) 2(15)-21= 30-21= 9

f) 3-4(5)= 3-20= -17

f) (4)+20= 24

question is incomplete.

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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