Factor completely. If the polynomial cannot be factored, say it is prime.15x3 + 4x2 - 4x
A. x2(3x + 2)(5x - 2)
B. x(3x + 2)(5x - 2)
C. x(5x + 2)(3x - 2)
D. (3x2 + 2)(5x - 2)
Answer: B
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Provide an appropriate response.Translate the following into an equation; then solve the equation: If twice a given number is subtracted from 20, the result is -4. Find the number.
Fill in the blank(s) with the appropriate word(s).
Find the exact value by using a half-angle identity.cos 
A. 
B. 
C. - 
D. - 
Solve.The sales of typewriters have declined considerably in recent years because of the advent of computers. Assume that there were 21 million typewriters sold in 1980 and 5 million sold in 1990. In addition, assume the sales are decreasing according to the exponential decay model. Find the value k, and write an exponential function that describes the number of typewriters sold after time t, in years. (Round decimals to three places.)
A. k = 0.161; S(t) = 21e-0.161t, where S(t) is in millions and t is the number of years since 1980. B. k = 0.304; S(t) = 21e-0.304t, where S(t) is in millions and t is the number of years since 1980. C. k = -0.144; S(t) = 21e-0.144t, where S(t) is in millions and t is the number of years since 1980. D. k = 0.144; S(t) = 21e-0.144t, where S(t) is in millions and t is the number of years since 1980.
Use Descartes' rule of signs to find the number of possible positive, negative, and nonreal roots for the following equation.
?
?
A. 0 positive; 1 negative; 4 nonreal B. 0 positive; 0 negative; 5 nonreal C. 0 positive; 0 or 2 negative; 3 or 5 nonreal D. 2 positive; 1 or 3 negative; 2 or 0 nonreal E. none of these