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Evaluating Expressions and Combining Like Terms

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1. Evaluate 9x+4 when x = 7

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2. When there is no number next to a variable, what number should you write in?

Hint: You need to write a complete sentence.

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3. Evaluate 3a+7b when a=1 and b= -4

+4. Simply the below expression

10x+7y – 3x +2y

+5. Simply the below expression

12a+2b-a+6b

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6. Evaluate 10w2 – 9 when w=2

+7. Simply the below expression

18x+12+2x

+8. Simply the below expression

-9h+7h-12+7

+ 9. Simplify the below fraction. Give your answer as a fraction.

€

9

11•3

4

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10. Evaluate 8+9x – 1 when x= 4.

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11. What are the steps to make a decimal into a fraction in the calculator?

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12. What is the perimeter of the below shape?

2x

10x+4