Perform the indicated operation or operations.
+ 
A. 
B. 
C. 
D. 
Answer: C
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Find the derivative.
A. 
x7 sin (x6)
B. 6x5 sin (x6)
C. -cos (x6) - 1
D. sin (x6)
All references are to the figure below. The distance between A and D is a, and the distance between D and C is x. 
Assuming that A = 36°, ?BDC = 42°, and c2 = 21, find h, x, and a.
A. h ? 12.3, x ? 13.7, a ? 3.3 B. h ? 14.1, x ? 15.6, a ? 3.7 C. h ? 12, x ? 14, a ? 3.3 D. h ? 14, x ? 16, a ? 3.7
Use properties of logarithms to expand the logarithmic expression as much as possible. Where possible, evaluate logarithmic expressions without using a calculator.log 
A. log (3x4
) - log (10(x + 3)2)
B. log 3 + log x4 + log (3 - x)1/5 - log 10 - log (x + 3)2
C. log 3 + 4log x + 
log (3 - x) - log 10 + 2log (x + 3)
D. log 3 + 4log x + 
log (3 - x) - log 10 - 2log (x + 3)
Use regression to solve the problem. Round numbers to the nearest hundredth.The first column shows the independent variable (x). The second column shows the dependent variable (y).
Use linear regression to predict the value of y when x = 21.
A. 66.94 B. 62.74 C. 73.24 D. 69.04