MCAS 1999, 8th Grade Math, Questions 21-24

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Question #21

Jake reads in the newspaper that one U.S. dollar was worth $1.37 in Canadian money. If n stands for a number of U.S. dollars, which equation gives the value, v, of those dollars in Canadian money?

A. v = n + 1.37

B. v = n - 1.37

C. v = n / 1.37

D. v = 1.37n

Question #22

The area of square A is 4 square units. The sides of square B are twice as long as the sides of square A. What is the area of square B?

A. 8 square units.

B. 64 square units.

C. 32 square units.

D. 16 square units.

Question #23 (Open-Response Question)

Galileo discovered that there is a relationship between the time it takes for a clock pendulum to swing back and forth and the length of the pendulum.

a. According to the pattern shown in the table, what would be the length of the pendulum if the swing took 6 seconds?

b. On the grid in your Student Answer Booklet [editor's note: on any piece of graph paper], draw a graph from this data to show the relationship between the time of the swing and the length of the pendulum.

c. Describe how the length of the pendulum can be calculated for swings of up to 12 seconds.

d. Write an equation that shows the relationship between the pendulum length, L, and the number of seconds, t, of the swing.

Question #24

Which of the following patterns could be folded to form a square pyramid?

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