Solve the problem.A boat heads upstream a distance of 30 miles on the Mississippi river, whose current is running at 5 miles per hour. If the trip back takes an hour less, what was the speed of the boat in still water? Give the answer rounded to two decimal places, if necessary.
A. 18.03 mph
B. 6 mph
C. 15 mph
D. 16.58 mph
Answer: A
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Find 
by using logarithmic differentiation.y = 
A. 
B. 
C. 
D. 
Use the Runge-Kutta method to find y-values of the solution for the given values of x and ?x, if the curve of the solution passes through the given point.
= x + sin y; x = 0 to 0.3; ?x = 0.1; (0, 1)
A. 
B. 
C. 
D. 
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? Fractional sacks are allowed.
A. 0 sacks of soybeans and 4 sacks of oats
B.
| 2 sacks of soybeans and 0 sacks of oats |
C.
sacks of soybeans and 
sacks of oatsD.
sacks of soybeans and 
sacks of oatsGraph the function.y = 4 sin 
A. 
B. 
C. 
D. 