Solve the problem.A railroad car cost $12,300 and has an estimated life of 11 years and a scrap value of $1353. Find the book value at the end of 9 years using the straight-line method. Round to nearest dollar.
A. $2236
B. $8957
C. $3343
D. $11,305
Answer: C
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Determine whether the variation between the indicated quantities is direct or inverse.The time to paint a house and the number of people painting.
A. Inverse B. Direct
Solve.A multiple birth is any birth with 2 or more children born. The birth rate is the number of births per 1000 women. In one country, the birth rate B of multiple births as a function of age a is given by the function 
for 
What is the domain of the linear function?
A. (15, 47) B. [15, 47] C. [2, ?) D. [15, ?)
Solve.
+ 
= 
A. -7, 1 B. 1 C. 7, 1 D. -7, -1
Use the appropriate formula to solve the problem.Levi borrowed $5709 at 9% simple interest for 6 months. How much will the interest amount to? What is the total amount that Levi will have to pay back at the end of 6 months? Round answers to the nearest cent if necessary.
A. $259.06; $5968.06 B. $256.91; $5965.91 C. $214.09; $5923.09 D. $299.72; $6008.72