Find the exact value of the expression.sin 20° cos 100° + cos 20° sin 100°
A. 
B. 
C. - 
D. - 
Answer: B
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Graph the curve over the given interval together with its tangent at the given value of x. Graph the tangent with a dashed line.y = cos(x), -2? ? x ? 2?, x = 
A. 
B. 
C. 
D. 
You use 187 feet of wire to make three sides of a rectangular pen. The fourth side is the wall of a barn. If you use w feet for the width, the area you enclose is given by
square feet.
A: Make a graph of A versus w. In choosing a viewing window, you should bear in mind that the width will certainly be no more than half the total amount of fence.B: What width gives the maximum area? Round your answer to two decimal places, if necessary.C: What is the maximum area? Round your answer to two decimal places, if necessary.
What will be an ideal response?
Express the following logarithm as specified.ln 7
in terms of ln 5 and ln 7
A. 
B. 
ln 7
C. ln 7 + 
D. ln 5 + 
Multiply.-1(-2)(-5)(-1)(-2)
A. -11 B. 20 C. -20 D. 11