A cylindrical tank is 20 ft 5 in. long and 4 ft 5 in. in diameter. How many cubic feet does it hold? Round your answer to three significant digits.
A. 626 cubic feet
B. 1,250 cubic feet
C. 157 cubic feet
D. 0.75 cubic feet
E. 313 cubic feet
Answer: E
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Use scientific notation to solve the problem.Suppose that we could somehow capture all the energy released by the Sun in just one second. For how many years could U.S. energy needs be met by this energy? Assume that the annual energy generation of the Sun is 
joules and that U.S. annual energy consumption is 1 × 1020 joules. Give your answer in scientific notation.
A. 3.17 × 101.3 years B. 7.61 × 106 years C. 1 × 1014 years D. 3.17 × 106 years
Factor, using the given factor. Assume all variables represent positive real numbers.x-7 - 4x-2; x-7
A. x-7(x - 4x5) B. x-7(1 - 4x5) C. x-7(1 + 4x7) D. x-7(x - 4x6)
If possible, simplify the expression. If any variables exist, assume that they are positive.
- 
+ 
A. 
B. - 
C. 
D. 
Find the indicated matrix.Let A = 
and B = 
. Find AB.
A. 
B. not defined
C. 
D. 