Find the value of the specified finite sum.Given 
= -6, find 
.
A. 42
B. -1
C. -42
D. 1
Answer: C
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Solve the problem.At the end of 9 mo, the balance of an account earning annual simple interest is $9270. If at the end of 15 mo the balance is $9450, how much money was originally in the account?
A. $8970 B. $9030 C. $8940 D. $9000
Find the vertices and the foci of the given ellipse.
+ 
= 1
A. V: (0, -20), (0, 20); F: (0, -12), (0, 12) B. V: (-20, 0), (20, 0); F: (0, -16), (0, 16) C. V: (-20, 0), (20, 0); F: (-12, 0), (12, 0) D. V: (0, -20), (0, 20); F: (-16, 0), (16, 0)
Find the coordinates of the vertex and x-intercepts for the quadratic function.f(x) = x2 + 6x + 8
A. vertex (-3, -1) x-intercepts (-2, 0), (- 4, 0) B. vertex (3, -1) x-intercepts (2, 0), (4, 0) C. vertex (-3, 1) x-intercepts (-2, 0), (- 4, 0) D. vertex (3, 1) x-intercepts (2, 0), (4, 0)
Solve the problem.Suppose the demand for a certain item is given by D(p) = -3p2 + 3p + 4, where p represents the price of the item. Find D'(p), the rate of change of demand with respect to price.
A. D'(p) = -3p2 + 3 B. D'(p) = -3p + 3 C. D'(p) = -6p + 3 D. D'(p) = -6p2 + 3