Use the formula for the sum of the first n terms of a geometric sequence to solve.Find the sum of the first 9 terms of the geometric sequence: -5, -10, -20, -40, -80, . . . .
A. -2553
B. -2518
C. -2555
D. -2575
Answer: C
Mathematics
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Find the vertices and foci of the ellipse.144x2 + 64y2 = 9,216
A. Vertices: (±8, 0); Foci: (±4
, 0)
B. Vertices: (0, ±8); Foci: (0, ±4
)
C. Vertices: (±12, 0); Foci: (±4
, 0)
D. Vertices: (0, ±12); Foci: (0, ±4
)
Mathematics
Use the indicated property to provide a new expression equal to the given expression. Simplify, if possible.8 ? 
; inverse
A. 8 B. -1 C. 1 D. 64
Mathematics
Solve.Find the area of a parallelogram with a base = 18 feet and height = 17 feet.
A. 306 ft2 B. 153 ft2 C. 35 ft2 D. 612 ft2
Mathematics
Identify the polynomial as a monomial, binomial, trinomial, or none of these. Give its degree.
r3 + 
r2
A. Binomial, degree 5 B. Binomial, degree 4 C. Binomial, degree 3 D. Trinomial, degree 2
Mathematics