Solve the problem.Robert receives a commission of $145 on sales of $2900. What is his commission rate?
A. 10%
B. 4%
C. 6%
D. 5%
Answer: D
Mathematics
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Find the length of the parametric curve defined over the given interval.x = 5 sin t - 5t cos t, y = 5cos t + 5t sin t, 0 ? t ? 
A. 
?2
B. 
?2
C. 
?
D. 
?2
Mathematics
Find the slope of the line passing through the two given points.(-2, -7) and (7, -7)
A. -5 B. 1 C. 0 D. 5
Mathematics
Let a and b be positive numbers. Determine whether the statement is true or false.(-a)(-b) is a positive number.
A. True B. False
Mathematics
Make the indicated conversion within units of time.Convert 192 hours to days.
A. 96 days B. 56 days C. 64 days D. 8 days
Mathematics