Solve the problem.Assume that "The Dreaded Dree," a boat that tours the Colorado River, typically runs at 9 mph in still water. If the Colorado is flowing at 4.5 mph, how long will it take "The Dreaded Dree" to cruise 3 miles upstream?
A. 1.5 minutes
B. 40 minutes
C. 90 minutes
D. 15 minutes
Answer: B
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Translate into an equation, and then solve the equation.Double what number times 4 equals sixteen?
A. 2x = 4 ? 16; 2 B. 2x = 4 ? 16; 32 C. 2x ? 4 = 16; 32 D. 2x ? 4 = 16; 2
Solve the problem.Chandra has 3 liters of a 28% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of 16% solution?
A. 4 liters of 7% solution B. 4 liters of 5% solution C. 4 liters of 8% solution D. 4 liters of 10% solution
Factor using the trial and error method.8x2 + 18x + 9
A. (8x - 3)(x - 3) B. (4x - 3)(2x - 3) C. (8x + 3)(x + 3) D. (4x + 3)(2x + 3)
Solve the problem.To save for retirement, you decide to deposit $1250 into an IRA at the end of each year for the next 40 years. If the interest rate is 10% per year compounded annually, find the value of the IRA after 40 years. Round to the nearest dollar.
A. $553,241 B. $30,092,655 C. $55,324 D. $501,810