Solve the problem.Between 7:00 AM and 8:00 AM, trains arrive at a subway station at a rate of 10 trains per hour 
per minute). The following formula from statistics can be used to determine the probability that a train will arrive within t minutes of 7:00 AM. F(t) = 1 - e-0.17tDetermine how many minutes are needed for the probability to reach 30%.
A. 5.96 min
B. 2.10 min
C. 3.18 min
D. 7.85 min
Answer: B
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A study prepared for the National Association of Realtors estimates that the number of housing starts per year over the next 5 yr will be 
million units, where r (percent) is the mortgage rate. Use differentials to estimate the decrease in the number of housing starts when the mortgage rate is increased from 17% to 17.8%. Round to the nearest unit.
?
Give your answer as a number without the units.
Fill in the blank(s) with the appropriate word(s).
Write the expression in terms of sine and cosine, and simplify so that no quotients appear in the final expression.
A. cos3? B. sin ? C. tan2? D. sec2?
Solve the equation.
x - 5 = - 
x
A. {5} B. {-5} C. {-7} D. {7}
Tell which signed number corresponds to the situation.Losing 21 cents
A. -21 B. +21