Simplify the expression. Assume that all variables are positive when they appear.
A. 7
+ 8
B. 6
- 4
C. 6
- 8
D. 5
- 4
Answer: D
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If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (4 cos t)i + (3 sin t)j
A. a = (4 cos t)i + (3 sin t)j B. a = (-4 sin t)i + (-3 cos t)j C. a = (-4 cos t)i + (-3 sin t)j D. a = (4 sin t)i + (3 cos t)j
First estimate the answer. Then add or subtract to find the exact answer. Write answer as a mixed number. 
A. Estimate: 9; Exact: 8
B. Estimate: 9; Exact: 8
C. Estimate: 8; Exact: 8
D. Estimate: 8; Exact: 6
Solve the problem.The following data is exactly linear. Find a linear function that models the data, and use the function to solve the inequality f(x) > 
.
A. x < 2
B. x > 
C. x > 
D. x > - 
Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
and 
A. Yes B. No