Solve the problem.Suppose a certain drug is administered to a patient, with the percent of concentration in the bloodstream t hr later given by 
On what time interval is the concentration of the drug increasing?
A. (0, 6)
B. (1, ?)
C. (6, ?)
D. (0, 1)
Answer: D
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When a skydiver jumps from an airplane his velocity V, in feet per second, increases toward a maximum of 175 feet per second. (This is terminal velocity.) The table below shows the difference 
between the terminal velocity and the velocity after t seconds.
t 0 5 10 15 D 175.00 97.72 54.57 30.47? A: Find an exponential model for the data. Be careful. The data are given in steps of 5 seconds. Round your answer to two decimal places, if necessery.B: Find a formula that gives the velocity V after t seconds. Round your answer to two decimal places, if necessery.C: Make a graph of V versus t over the first 10 seconds. Include the horizontal line representing the terminal velocity.E: According to the model, how long does it take for the skydiver to reach 92.00% of terminal velocity? Round your answer to two decimal places. What will be an ideal response?
Solve.A certain flexible cable between two towers 400 ft apart can be represented by 
. Sketch the graph representing the cable for 
A. 
B. 
C. 
D. 
Solve the problem.Suppose that the revenue from selling x radios is r(x) = 70x - 
dollars. Use the function r '(x) to estimate the increase in revenue that will result from increasing production from 120 radios to 121 radios per week.
A. $45.80 B. $46.00 C. $94.00 D. $58.00
Factor out the GCF from the polynomial.18x8y9 + 36x2y6 - 36x6y2
A. 18x2(1x6y9 + 2y6 - 2x4y2) B. 18x2y2(1x6y7 + 2y4 - 2x4) C. 18(1x8y9 + 2x2y6 - 2x6y2) D. x2y2(18x6y7 + 36y4 - 36x4)