Solve the problem.During a drought, the water level in a river dropped 3 inches each day for 4 straight days. What was the change in the water level of the river during this this period?
A. 12 inches
B. -7 inches
C. 7 inches
D. -12 inches
Answer: D
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Solve.Wind resistance or atmospheric drag tends to slow down moving objects. Atmospheric drag varies jointly as an object's surface area A and velocity v. If a car traveling at a speed of 40 mph with a surface area of 35 ft2 experiences a drag of 168 N (Newtons), how fast must a car with 49 ft2 of surface area travel in order to experience a drag force of 388.08 N?
A. 63 mph B. 68 mph C. 71 mph D. 66 mph
Solve the problem. Express the answer in scientific notation to two decimals unless requested otherwise.Assume that the volume of the earth is 5 × 1014 cubic meters and the volume of a bacterium is 2.5 × 10-16 cubic meters. If the earth could be filled with bacteria, how many would it contain? (Round to one decimal place.)
A. 5.0 × 1031 bacteria B. 2.0 × 10-30 bacteria C. 2.0 × 1030 bacteria D. 5.0 × 10-31 bacteria
Compute and simplify the difference quotient 
, h ? 0.f(x) = 
A. 
B. 
C. - 
D. 
Simplify the expression. If the expression contains any variables, assume that they represent positive real numbers. Write your answer with only positive exponents.
A. 7
B. 7x
C. 78
D. 