Find the indicted product and simplify if possible.The amount of material required to make a spherical shell is given by 
(R - r)(R2 + Rr + r2).
A. 
R3 - 
r3
B. 
R3 + 
R2r + 
Rr2 + 
r3
C. 
R3 - 
R2r + 
Rr2 - 
r3
D. 
R3 - r3
Answer: A
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Find the average value of the function over the given interval.y = x2 - 4x + 3; [0, 9]
A. 12
B. 
C. 48
D. 36
Write an equation for the hyperbola.
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Find (a) the gross profit, (b) the net income before taxes, and (c) the net income after taxes.MidState Machinery has a cost of goods sold of 
operating expenses of 
taxes of 
and net sales of 
A. (a) $222,000 (b) $132,000 (c)$123,000 B. (a) $198,000 (b) $132,000 (c)$123,000 C. (a) $24,000 (b) $198,000 (c)$189,000 D. (a) $24,000 (b) $132,000 (c)$123,000
Solve. Write the answer as a mixed number in simplest form.A rectangular flower bed in front of a building measures 1
feet by 9
feet. What is the total area of the flower bed? Hint: The area of a rectangle is the product of the length times the width.
A. 14 sq ft
B. 9
sq ft
C. 16 sq ft
D. 17 sq ft