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 9 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 oats costs $10 and contains 20 lb of protein, 5 lb of fat, and 1 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 oats
B.
| 2 sacks of soybeans and 0 sacks of oats |
C.
sacks of soybeans and 
sacks of oatsD. 0 sacks of soybeans and 2 sacks of oats
Answer: B
Mathematics
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Evaluate the expression.-73
A. 21 B. -21 C. -343 D. 343
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Determine whether the given function is one-to-one. If it is one-to-one, find its inverse.f(x) = 
A. f-1(x) = (x + 5)3
B. f-1(x) = x3 + 5
C. f-1(x) = 
- 5
D. f-1(x) = (x - 5)3
Mathematics
Add or subtract as indicated.(8x2 - xy - y2) + (x2 + 4xy + 9y2)
A. 9x2 + 5xy + 10y2 B. 7x2 - 5xy - 10y2 C. 9x2 + 3xy + 8y2 D. 8x2 + 4xy + 9y2
Mathematics
Multiply.10 ? 
A. 
B. 
C. 
D. 
Mathematics