Factor completely.7x2 - 7x - 42
A. 7(x + 2)(x - 3)
B. (7x + 14)(x - 3)
C. 7(x - 2)(x + 3)
D. prime
Answer: A
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Find the expected value.A fair coin is tossed three times, and a player wins $3 if 3 tails occur, wins $2 if 2 tails occur and loses $3 if no tails occur. If one tail occurs, no one wins. What is the expected value of the games?
A. $0.75 B. $2.00 C. -$3.00 D. $3.00
Find the expected value.A new light bulb has been found to have a 0.02 probability of being defective. A shop owner receives 500 bulbs of this kind. How many of these bulbs are expected to be defective?
A. 20 B. 100 C. 10 D. 500
Solve the problem.A real estate development consists of home sites that range in width from 48 to 94 feet and in depth from 138 to 188 feet. Using x as the variable in both cases, write absolute value inequalities that correspond to these ranges.
A. ? 23,
? 25
B. ? 71,
? 163
C. ? 48,
? 138
D. ? 46,
? 50
Solve by graphing. -2y = 6x + 3y = -10
A. (-3, 1) B. (-3, -1) C. (-1, -3) D. (-1, 3)