Factor completely, or state that the polynomial is prime.30a2b + 15ab - 90b
A. 5(6a - 9)(a - 2)
B. 5(6a + 9)(a - 2)
C. 5b(6a - 9)(a + 2)
D. prime
Answer: C
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Find the particular solution to the given differential equation that satisfies the given conditions.D4y + 2 D3y - 15 D2y = 0; y = 0, Dy = 9, D2y = 27, and 
when x = 0
A. y = -3 - 3e3x B. y = c1 + c2x + c3e3x + c4e-5x C. y = -3 + 3e-3x D. y = -3 + 3e3x
Graph the pair of parametric equations with the aid of a graphing calculator.x = cos 5t, y = sin 2t, 0 ? t ? 2?
A. 
B. 
C. 
D. 
Factor the polynomial by removing any common monomial factor.7x4 - 21x2
A. 7x2(x2 - 21) B. 21x2(x2 - 1) C. 7(x4 - 3x) D. 7x2(x2 - 3)
Solve the problem.There are currently 69 million cars in a certain country, increasing exponentially by 2.7% annually. How many years will it take for this country to have 83 million cars? Round to the nearest year.
A. 7 yr B. 98 yr C. 5 yr D. 4 yr