Solve the problem.In how many ways can a class president and a class secretary be chosen from a group of 8 candidates?

A. 336
B. 15
C. 56
D. 16


Answer: C

Mathematics

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Evaluate the integral.

A. sin-1   + C
B. sin-1   + C
C. tan-1   + C
D. tan-1   + C

Mathematics

Solve for the angle ?, where 0 ? ? ? 2?sin 2? + cos ? = 0

A. ? = 
B. ? =  
C.
D. ? = 

Mathematics

Find the requested partial derivative. if    and 

A.
B.
C.
D.

Mathematics

Solve the problem. Write ratios in lowest terms.The table below shows the amounts of pollutants (in parts per million) in a sample of rainwater. Find the ratio of pollutant D to pollutant B. 

A.
B.
C.
D.

Mathematics