Solve the problem.A truck driver started a trip at an average speed of 70 miles per hour. Once snow began to fall, he had to drop his speed to 50 miles per hour. It took him 14.2 hours to reach his destination, which was 804 miles away. How many hours after the driver started did the snow begin to fall?
A. 4.5 hr
B. 4.7 hr
C. 9.5 hr
D. 9.7 hr
Answer: B
Mathematics
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Solve the problem.Arches in the shapes of parabolas are often used in construction. Find the equation of a parabolic arc that is 20 feet high at its highest point and 22 feet wide at the base, as illustrated in the figure. Place the origin at the midpoint of the base.
A. y = - 
x2 + 20
B. y = -x2 + 22
C. y = -x2 + 20
D. y = 
x2 + 20
Mathematics
Shade the solution set in the xy-plane.(x + 2)2 + (y - 4)2 ? 9(x - 2)2 + (y - 4)2 ? 9
A. 
B. 
C. 
D. 
Mathematics
Divide. If the division is not possible, write "undefined."
A. 1 B. Undefined C. 0 D. 8
Mathematics
Solve the equation.5(2z - 5) = 9(z + 2)
A. -2 B. -7 C. 7 D. 43
Mathematics