Solve the problem.The gravitational attraction A between two masses varies inversely as the square of the distance between them. The force of attraction is 9 lb when the masses are 2 ft apart, what is the attraction when the masses are 6 ft apart?
A. 2 lb
B. 4 lb
C. 1 lb
D. 3 lb
Answer: C
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Write the equation of a line through the given points in the form 
, where A, B, and C are integers and 
(-1, 0), (0, -1)
A. x + y = 1 B. x - y = -1 C. x - y = 1 D. x + y = -1
Solve the problem.A drilling rig cost $20,600 and has an estimated life of 8 years and a scrap value of $1,030. Find the book value at the end of 5 years using the straight-line method. Round to nearest dollar.
A. $7,725 B. $12,231 C. $8,369 D. $18,154
Solve the problem. Round approximations to the nearest cent.Kendal Cole scored 75 and 78 on his first two business math tests. Find the minimum score he must get on his third test to have an average of 80 in the course.
A. 87 B. 85 C. 77 D. 79
Find the unknown number in the proportion. Round answer to the nearest hundredth when necessary.
= 
A. x = 24.84 B. x = 113.07 C. x = 0.04 D. x = 9.06