Solve the problem.A spherical water tank with an inner radius of 7 m has its lowest point 1 m above the ground. It is filled by a pipe that feeds the tank at its lowest point (see figure). Neglecting the volume of the inflow pipe, how much work is required to fill the tank if it is initially empty? Express the answer in terms of ?. 
A. 
? J
B. 
? J
C. 
? J
D. 
? J
Answer: D
Mathematics
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Find the slope of the line containing the given points. Simplify if possible.
A. 
B. 
C. - 
D. - 
Mathematics
Subtract.90 - (-22)
A. -68 B. 112 C. -112 D. 68
Mathematics
Multiply mentally.70 ? 90
A. 160 B. 6300 C. 6390 D. 6210
Mathematics
Add or subtract and simplify. Write the answer as a whole or mixed number when necessary.4
+ 10
A. 13
B. 14
C. 4
D. 15
Mathematics