MCAS 2001, 8th Grade Math, Questions 9 to 12

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Question #9

25% of what number is 100?


Question #10

Compute:


Question #11

What does x equal in the equation below?


Question #12

An eighth-grade class will perform the first four acts in the annual talent show. Every student is in exactly one of the four acts. The order in which the acts will be presented is to be decided by a drawing so that each act has an equal chance of being drawn.

a. Chantal is a member of the eighth-grade class. What is the probability that her act will be presented first?

b. Chantal's act was chosen to be presented first. Make a tree diagram, chart, or list showing all the possible orders in which the other three acts could be presented. Use the letters A, B, and C to represent these three acts.

c. Rory, Jesse, and Chantal are all members of the eighth-grade class who will each perform an act. What is the probability that Rory's act will immediately follow Jesse's? Explain how you found your answer.


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