Solve.The area of a circle varies directly as the square of the radius. What happens to the area if the radius is doubled?
A. The area is multiplied by 4.
B. The area is multiplied by 
.
C. The area is halved.
D. The area is doubled.
Answer: A
Mathematics
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Solve the problem.The area A of a triangle is 10x2 + 7x - 12. If the height of the triangle is 2x + 3, find the length of its base.
A. 2(5x + 4)
B. 2(5x - 4)
C. 5x - 4
D. 
Mathematics
Write using exponential notation.8 ? 8 ? 8
A. 81 B. 3 ? 8 C. 83 D. 38
Mathematics
Use the Rational Zeros Theorem to find all the real zeros of the polynomial function. Use the zeros to factor f over the real numbers. f(x) = x4 + 15x2 - 16
A. -4, 4; f(x) = (x - 4)(x + 4)(x2 + 1) B. -1, 1; f(x) = (x - 1)(x + 1)(x2 + 16) C. 1; f(x) = (x - 1)2(x2 + 16) D. -1, -4, 1, 4; f(x) = (x - 1)(x + 1)(x - 4)(x + 4)
Mathematics
Work the chain multiplication.8 ? 7 ? 0
A. 56 B. 0 C. 1 D. 15
Mathematics