Find the requested function value for the given function. Round the answer to the nearest tenth when necessary.If f(x) = 
, find the value of f(4).
A. 18
B. 16
C. 4
D. 4.5
Answer: C
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For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (9t sin t + 9 cos t)i + (9t cos t - 9 sin t)j + 9k; normal plane at t = 5.5?.
A. y = 9 B. x - y + z = -9 C. x + y + z = -9 D. y = -9
Solve the problem.The distance in feet it takes a car traveling at x mph to come to a full stop after hitting the brakes is given by 
Find the stopping distance for a speed of 50 mph. Round to the nearest foot.
A. 2 ft B. 3179 ft C. 3153 ft D. 3141 ft
Solve the compound inequality. Graph the solution set and write the solution in interval notation.x > 8 or x < 8
A. (-?, 8) ? (8, ?)
B. {8}
C. (8, ?)
D. (-?, 8)
Solve the problem.A real estate agent agrees to sell an office building according to the following commission schedule: $38,000 plus 15% of the selling price in excess of $700,000. Assuming that the office building will sell at some price between $700,000 and $1,100,000, inclusive, over what range does the agent's commission vary?
A. The commission will vary between $39,000 and$98,000, inclusive. B. The commission will vary between $38,000 and $193,000, inclusive. C. The commission will vary between $38,000 and $98,000, inclusive. D. The commission will vary between $143,000 and $203,000, inclusive.