1. Solve for x. x + 9 = 21
2. Solve for c.

c + 7 = 14
3. Solve for a.

3 + a = 6

4. -4a = -36

5. Three times a number is 36. What is the number?

6. The attendance at the Jazz Festival decreased by 74 people for the last 3 years. How many fewer people attended the festival this year than 3 years ago?

7. Carlos rode the elevator up 4 floors, then down 2 floors. He then rode down 5 more floors and got off on the first floor. Where was Carlos when he began his elevator ride?

8. A box contains 4 white crayons, 3 red crayons, 3 blue crayons, and 2 purple crayons. You pick a crayon at random, and then draw a second crayon without replacing the first. What is the probability of picking a white crayon, then a red crayon?

9. A jar contains 2 green, 3 white, and 5 black balls. The balls are selected at random, one at a time, and not replaced. What is the probability of selecting a white, then a green?

10. The ratio of crayons to pencils is 4 to 9. If there are 45 pencils, how many crayons are there?

11. Mary purchased a sweater for $35.80. Tax was 8.5%. What is the total cost of the sweater?

12. Convert the following decimal to a percent and fraction.

0.18