Solve the problem.A construction crane lifts a bucket of sand originally weighing 
at a constant rate. Sand is lost from the bucket at a constant rate of
. How much work is done in lifting the sand 
? (Neglect the weight of the bucket.)
A. 8000 ft ? lb
B. 7375 ft ? lb
C. 6750 ft ? lb
D. 8625 ft ? lb
Answer: B
Mathematics
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Evaluate the integral.
A. 
x
+ 11x + C
B. 
x
+ x + C
C. 
x
+ x + C
D. 
x2+ x + C
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Provide an appropriate response.What form do planes perpendicular to the y-axis have in spherical coordinates?
A. ? = a csc ? csc ? B. ? = a csc ? C. ? = a sin ? sin ? D. ? = a csc ?
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Use the present value formula to determine the amount to be invested now, or the present value needed.The desired accumulated amount is $9000 after 8 years invested in an account with 3% interest compounded semiannually
A. $7104.68 B. $7092.28 C. $1907.72 D. $11,420.87
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Find the sum or difference. Write the answer in standard form.3i + (-9 - i)
A. 9 - 2i B. -9 + 2i C. 9 - 4i D. -9 + 4i
Mathematics