Find the perimeter or area of the figure as indicated. Express your answer in simplified radical form.Find the area of the trapezoid.
A. 108
sq ft
B. 54
sq ft
C. 351
sq ft
D. 54
sq ft
Answer: D
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250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Carol scored 85 points on the exam. In approximately what percentile of the class does this score place her?
A. 84th percentile B. 95th percentile C. 34th percentile D. 68th percentile E. none of these
Perform the indicated computation. Write the answer in scientific notation.
A. 4.27 × 10-3 B. 4.27 × 10-13 C. 8.54 × 10-3 D. 8.54 × 10-13
Solve the problem.A traveling salesperson averaged 42 miles per hour on a 232 mile trip. How many hours were spent on the trip?
A. 5.52 hours B. 0.18 hours C. 2.76 hours D. 190 hours
Solve the problem.Suppose a tank contains 100 gallons of a solution of 10 lb of salt dissolved in water, which is kept uniform by stirring. If pure water is allowed to flow into the tank at a rate of 3 gallons per minute, and the mixture flows out at a rate of 2 gallons per minute, find an expression for the amount of salt in the tank after t minutes.
A. y = 
B. y = 
C. y = 
D. y = 100 (t - 100)2