Solve the problem.A truck driver started for his destination at an average speed of 70 miles per hour. Once snow began to fall, he had to drop his speed to 40 miles per hour. It took the driver 14 hours to reach his destination, which was 707 miles away. How many hours after the driver started did the snow begin to fall?
A. after 9.3 hr
B. after 4.7 hr
C. after 4.9 hr
D. after 9.1 hr
Answer: C
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Find the average rate of change for the function between the given values.f(x) = 
; from 1 to 5
A. -2
B. 
C. - 
D. -28
Perform the indicated operation. Simplify, if possible.
- 
A. 
B. 
C. 
D. 
Use the quotient rule to simplify the expression.
A. s4t10 B. s4t9 C. s8t12 D. s4t11
Jackson Farms have allotted a certain amount of land for cultivating soybeans, corn, and wheat. Cultivating 1 acre of soybeans requires 4 labor-hours, and cultivating 1 acre of corn or wheat requires 7 labor-hours. The cost of seeds for 1 acre of soybeans is $13, for 1 acre of corn is $20, and for 1 acre of wheat is $7. If all resources are to be used, how many acres of each crop should be cultivated if the following hold?
1,500 acres of land are allotted, 9,600 labor-hours are available, and $18,800 is available for seeds. a. 300 acres of soybeans, 500 acres of corn, 700 acres of wheat b. 100 acres of soybeans, 600 acres of corn, 700 acres of wheat c. 100 acres of soybeans, 500 acres of corn, 800 acres of wheat d. 300 acres of soybeans, 600 acres of corn, 800 acres of wheat