Verify the identity.
= cos 3x
What will be an ideal response?
= 
= cos 3x
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Suppose that y varies directly with x. Find an equation that relates x and y.y = 13 when x = 4
A. y = 0.31x B. y = 3.25x C. x = 3.25y D. y = 13x
Solve the problem.A sample of matter has a temperature distribution given by 
Describe the level surfaces and write an equation for the surface T = 300.
What will be an ideal response?
Solve the problem. Express your answer in scientific notation, and round to one decimal place. A computer can do one calculation in 1.4 × 10-7 seconds. How long would it take the computer to do a million (106) calculations?
A. 1.4 × 102 seconds B. 1.4 × 103 seconds C. 1.4 × 10-2 seconds D. 1.4 × 10-1 seconds
Use the data to complete the table.The following is the number of hours students studied per week on average. 
A. Frequency: 2, 5, 5, 4, 4 B. Frequency: 2, 5, 4, 5, 4 C. Frequency: 2, 5, 5, 3, 5 D. Frequency: 2, 4, 6, 4, 4