Perform the indicated operation and, if possible, simplify.
+ 
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Use a finite approximation to estimate the area under the graph of the given function on the stated interval as instructed.f(x) = 
between x = 2 and x = 8 using the "midpoint rule" with two rectangles of equal width.
A. 
B. 
C. 
D. 
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Find the slope of the polar curve at the indicated point.r = 9 + 8 sin ?, ? = 0
A. 
B. - 
C. 
D. - 
Mathematics
Express the vector as a product of its length and direction.
i - 
j + 
k
A. 
B. 
C. 
D. 
Mathematics
Evaluate the expression for the given replacement values. Write the answer in simplest form.x ÷ y for x = - 
, y = 
A. - 
B. - 
C. 
D. 
Mathematics