Find the derivative of f at the given point.f(x) = -4x2 + 7x at x = 5
A. -33
B. -13
C. 3
D. 33
Answer: A
Mathematics
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Solve the problem.The half-life of a certain radioactive substance is 13 years. Suppose that at time t = 0 , there are 20 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 20(1/2)t/26How many grams of the substance will remain after 39 years?
A. 0.88 g B. 1.77 g C. 7.07 g D. 3.54 g
Mathematics
Find the center of the ellipse.
+ 
= 1
A. (-6, 0) B. (6, 0) C. (0, -6) D. (16, 25)
Mathematics
Factor the sum or difference of two cubes.27p3 - 1
A. (3p + 1)(9p2 - 3p + 1) B. (3p - 1)(9p2 + 1) C. (3p - 1)(9p2 + 3p + 1) D. (27p - 1)(p2 + 3p + 1)
Mathematics
Perform the indicated operations.( 2x2 - 4x - 3) + ( -7x2 - 5x + 10)
A. 9x2 - 9x - 13 B. -5x2 - 9x + 7 C. 5x2 + 9x + 7 D. 9x2 - 9x + 13
Mathematics