?An employee of a delivery company earns $25.00 per hour driving a delivery van in an area where gasoline costs $2.60 per gallon. When the van is driven at a constant speed s (in miles per hour, with 
), the van gets 
miles per gallon. Determine the most economical speed s for a 100-mile trip on an interstate
highway.
?
A. ?The most economical speed is 52.0 mph.
B. ?The most economical speed is 48.0 mph.
C. ?The most economical speed is 25.0 mph.
D. ?The most economical speed is 50.0 mph.
E. ?The most economical speed is 53.0 mph.
Answer: D
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Use multiplication to check the answer. If an answer is incorrect, find the correct answer.
A. Correct B. Incorrect; should be 48 R2 C. Incorrect; should be 48 R4 D. Incorrect; should be 47 R3
Provide an appropriate response.Does knowing that 3 - x2y3 < 
< 3 tell you anything about 
Give reasons for your answer.
What will be an ideal response?
A variable force of magnitude F(x) moves a body of mass m along the x-axis from x1 to x2. The net work done by the force in moving the body from x1 to x2 is 
where v1 and v2 are the body's velocities at x1 and x2. Knowing that the work done by the force equals the change in the body's kinetic energy, solve the problem.How many foot-pounds of work does it take to throw a baseball 10 mph? A baseball weighs 5 oz, or 0.3125 lb.
A. 0.5 ft-lb B. 35.2 ft-lb C. 1.1 ft-lb D. 15.6 ft-lb
Simplify.(-5)2 + (-8)2 + 11
A. -100 B. 180 C. 100 D. -180