Find the first term and the common difference.
, 
, 
, 
, . . .
A. a1 = 
, d =
B. a1 = 
, d = - 
C. a1 = 
, d =
D. a1 = 
, d =- 
Answer: B
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 0; local maximum at x = 2; concave down on (0, ?); concave up on (-?, 0) B. Local minimum at x = 2; local maximum at x = 0; concave down on (0, ?); concave up on (-?, 0) C. Local minimum at x = 2; local maximum at x = 0; concave up on (0, ?); concave down on (-?, 0) D. Local minimum at x = 0; local maximum at x = 2; concave up on (0, ?); concave down on (-?, 0)
Solve.The formula for the area of a trapezoid is A = 
(b + B)h. If the area, A, is 166.5 square meters, and the bases, b and B, are 17 meters and 20 meters , find the height, h, of this trapezoid.
A. h = 148 m
B. h = 340 m
C. h = 9 m
D. h = 18
m
Solve the variation problem.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 feet from a light is 3 foot candles, find the intensity on a screen 20 ft from the light.
A. 
foot-candles
B. 
foot-candles
C. 1
foot-candles
D. 2 foot-candles
Find the whole.81 rabbits is 60% of what number of rabbits?
A. 14 rabbits B. 135 rabbits C. 49 rabbits D. 1350 rabbits