Solve the problem.The time it takes to travel a given distance at constant speed is given by the formula  where t is the time, d is the distance, and r is the rate of travel. At 30 miles per hour, what distance can be traveled in 4 hours?

A. 24 mi
B. 60 mi
C. 240 mi
D. 120 mi


Answer: D

Mathematics

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Solve the inequality and graph the solution on the real number line. ? ?

A.


B.


C.


D.


E.


Mathematics

Convert as indicated.90 ft to yards

A. 3240 yd B. 270 yd C. 10 yd D. 30 yd

Mathematics

Solve the problem.The rate of growth of profit (in millions) from an invention is approximated by  where x represents time in years. The total profit in year 1 that the invention is in operation is $45,000. Find the total profit function P(x).

A. P(x) = -.5e-x2+ 229,000
B. P(x) = -.5e-x2+ 0.229
C. P(x) = - e-x2- 229,000
D. P(x) = - e-x2- 0.229

Mathematics

The graphs show the position s, velocity v = ds/dt, and acceleration a = d2s/dt2 of a body moving along a coordinate line as functions of time t. Which graph is which?

A. B = position, A = velocity, C = acceleration B. A = position, C = velocity, B = acceleration C. C = position, A = velocity, B = acceleration D. A = position, B = velocity, C = acceleration

Mathematics