Solve the problem.A deep sea diving bell is being lowered at a constant rate. After 12 minutes, the bell is at a depth of 600 ft. After 30 minutes the bell is at a depth of 1900 ft. What is the average rate of lowering per minute? Round to the nearest hundredth as needed.
A. 63.33 ft per minute
B. 43.33 ft per minute
C. 72.22 ft per minute
D. 0.01 ft per minute
Answer: C
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This model is of the form f(x) = mx + b. Determine what m and b signify.The cost, in dollars, of retaining the services of a computer repairman in Anchorville is given by 
where x is the number of hours worked.
A. 32 signifies the hourly rate, and 70 signifies the overhead charge. B. 70 signifies the hourly rate, and 32 signifies the overhead charge. C. 102 signifies the cost for an on-site inspection. D. -70 signifies the hourly rate, and 32 signifies the travel cost.
Solve the system.x2 + y2 = 36x2 - y2 = 36
A. {(6, 0), (-6, 0)} B. {(6, 0)} C. {(0, -6)} D. {(0, 6), (0, -6)}
Simplify the expression. First use the distributive property to remove any parentheses.4(6x + 2y + 8)
A. 24x + 2y + 8 B. 24x + 2y + 32 C. 24x + 8y + 32 D. 24x + 8y + 8
Solve the problem.During the first seconds, the height h in feet of a baseball after t seconds is given by 
Estimate the height of the ball after 4 seconds.
A. 511 ft B. 355 ft C. 256 ft D. 211 ft