1. 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 Ratio and Proportions Percents Direct and Inverse Variation Simplifying Rational Expressions Review

2. Solve the proportion.

9. Check your answers:

10. Solve the proportion.

11. Check your answers:

12. 52 is 12.5% of what number?

14. How much money is 35% of $750?

16. How much is 4.3% of 500 tons?

18. 30 inches is what percent of 40 feet?

19. 40 feet = 480 inches

20. In the survey, 572 people said they think the ozone layer is getting worse. What was the total number of people surveyed?

22. The variables x and y vary directly. When x = 18 and y =6, write an equation that relates x and y.

24. The variables x and y vary inversely. When x = 16 and y = 1, write an equation that relates x and y.

26. The volume V of a gas at constant temperature varies inversely with the pressure P. When the volume is 100 cubic inches, the pressure is 25 pounds per cubic inches. Write an equation that relates V and P.

28. The graph models the relationship between the time needed to paint a house and the number of painters. For the values shown, the time needed T and the number of painters n vary inversely. Find an inverse variation model relating T and n.

30. Decide if the data in the table show represents direct or inverse variation.

31. Inverse variation

32. Simplify the expression.

42. Use the substitution method to solve the linear system.

44. Simplify the expression.

46. Use the quadratic formula to solve the equation.

48. Solve the following equation by factoring.

50. Sketch the graph of the inequality.

51. x-intercept: y-intercept: Test (2,2)