Solve the problem.The speed of a vehicle is inversely proportional to the time it takes to travel a fixed distance. If a vehicle travels a fixed distance at 40 miles per hour in 30 minutes, how fast must it travel to cover the same distance in 20 minutes?
A. 15 mph
B. 
mph
C. 
mph
D. 60 mph
Answer: D
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Determine if the given function y = f(x) is a solution of the accompanying differential equation.Differential equation: 3xy' + 3y = cos xInitial condition: y(?) = 0Solution candidate: y = 
A. No B. Yes
Determine whether or not the graph is a graph of a function of x.
A. Function B. Not a function
Solve the problem. Use 
A business invests $5800 in a savings account for 2 years. At the beginning of the second year, an additional $2700 is invested. If a total of $9304.05 is in the account at the end of the second year, what is the annual interest rate?
A. 5.5% B. 4.5% C. 6% D. 6.5%
Use the compound interest formula to determine the future value of the given principal P.$830 at 2% compounded continuously for 19 years
A. $1213.70 B. $922.13 C. $11,088,573.25 D. $19,694.45