Write the word statement as an equation. Use x to represent the unknown number. Do not solve.The sum of twice a number and 9 is 21.
A. x + 18 = 21
B. 2x + 9 = 21
C. 2(x + 9) = 21
D. 18x = 21
Answer: B
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Solve.The rate of return of certain investments increases as the risk factor of the investment increases. An investment with a risk factor of 2 has a rate of return of 5.0%. An investment with a risk factor of 18 has a rate of return of 20.0%. What is the average rate of return per unit of risk?
A. 0.72% per unit risk B. 0.94% per unit risk C. 1.38% per unit risk D. 1.07% per unit risk
Find the volume of the indicated region.the region that lies under the paraboloid 
and above the triangle enclosed by the lines 
, and 
A. 1,536 B. 12,288 C. 192 D. 17,408
Determine whether the nonincreasing sequence converges or diverges.a1 = 1, an+1 = 4an - 3
A. Diverges B. Converges
Solve the problem using the rule of 78s.A fisherman buys a new boat for $45,000. He makes a down payment of $17,000 and finances the balance at 8% APR over 60 months. Before making the 45th payment, the fisherman decides to pay the remaining balance on the loan. How much interest will the fisherman save?
A. $397.69 B. $359.78 C. $639.15 D. $369.85