Use integration by parts to establish a reduction formula for the integral.
A. 
= sinn-1 x cos x + (n - 1) 
B. 
= - 
sinn-1 x cos x + 
C. 
= sinn-1 x cos x - (n - 1) 
D. 
= - 
sinn-1 x cos x - 
Answer: B
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Solve the problem.From a distance of x feet to a 120-meter-high radio tower, the angle of elevation is ? degrees. Then 
Use a reciprocal identity to rewrite this formula.
A. 120 sec ?
B. 120 cot ?
C. 
D. 
Add or subtract. Write the answer in lowest terms.
+ 
A. 
B. 
C. 
D. 
Write the decimal as a percent.0.035
A. 0.0035% B. 3.5% C. 0.035% D. 35%
Solve the problem.Suppose an animal feed to be mixed from soybean meal and oats must contain at least 100 lb of protein, 20 lb of fat, and 12 lb of mineral ash. Each 100-lb sack of soybean meal costs $20 and contains 50 lb of protein, 10 lb of fat, and 8 lb of mineral ash. Each 100-lb sack of alfalfa costs $11 and contains 30 lb of protein, 8 lb of fat, and 3 lb of mineral ash. How many sacks of each should be used to satisfy the minimum requirements at minimum cost?
A. 
sacks of soybeans and 
sacks of alfalfa
B. 2 sacks of soybeans and 0 sacks of alfalfa
C. 
sack of soybeans and 
sack of alfalfa
D. 0 sacks of soybeans and 2 sacks of alfalfa