Subtract. 10 - (-10)

A. 10
B. 0
C. 20
D. -20


Answer: C

Mathematics

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Solve the problem.dy/dt = ky + f(t) is a population model where y is the population at time t and f(t) is some function to describe the net effect on the population. Assume k = .02 and  when t = 0. Solve the differential equation of y when f(t) = -19t.

A. y = 950t + 47,500 - 37,500e.02t B. y = -950t - 47,500 - 37,500e.02t C. y = 950t + 47,500 - 37,500e-.02t D. y = -950t + 47,500 - 37,500e-.02t

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Solve the problem.The disk (x - 4)2 + y2 ? 9 is revolved about the y-axis to generate a torus. Find its volume. (Hint: ?, since it is the area of a semicircle of radius 3.)

A. 36? B. 72?2 C. 18?2 D. 36?2

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Write the phrase as a mathematical expression. Use x as the variable.A number divided by -19

A.
B.
C.
D.

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Find dy for the given values of x and ?x.y = x3 - 4x2 + 2x + 1; x = 8, ?x = -0.3

A. 39 B. -37 C. 37 D. -39

Mathematics