Multiply and simplify.
? 
A. 
B. 
C. 
D. 
Answer: B
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For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (4t sin t + 4 cos t)i + (4t cos t - 4 sin t)j + 8k; normal plane at t = 5.5?.
A. x - y + z = -4 B. y = -4 C. x + y + z = -4 D. y = 4
Solve the problem.Use a tree diagram showing all possible results when a die is rolled twice to list the ways of getting exactly one die showing a 3.
A. (3, 1),(3, 2),(3, 3), (3, 4),(3, 5),(3, 6), (1, 3), (2, 3), (4, 3), (5, 3), (6, 3) B. (3, 1),(3, 2),(3, 4),(3, 5),(3, 6) C. (3,3) D. (3, 1),(3, 2),(3, 4),(3, 5),(3, 6), (1, 3), (2, 3), (4, 3), (5, 3), (6, 3)
The bar graph below shows the temperatures recorded as the high temperature in Little City on Brianna's birthday for the indicated years. 
In which year was the recorded temperature the highest?
A. 2001 B. 2003 C. 2002 D. 1998
Solve the problem.Patients at a medical clinic have a wait time modeled by 
for 
where the random variable x is in minutes. Find the mean, the variance, and the standard deviation.
A. ? = 6, ?2 = 36, ? ? 6
B. ? = 6, ?2 = 72, ? ? 6
C. ? = 12, ?2 = 36, ? ? 6
D. ? = 12, ?2 = 72, ? ? 6