Factor.x2 - x - 12
A. (x + 3)(x - 4)
B. x2 - x - 12
C. (x + 1)(x - 12)
D. (x + 4)(x - 3)
Answer: A
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How many different 7-number combinations are there in a lock with 21 numbers? ?
A.
B.
116,280
C.
D.
21(20)(19)(18)(17)
E.
?None of the above.
Solve and graph the inequality.
(x + 6) ? 
(x + 1)
A. x ? - 24
B. x ? 24
C. x ? - 24
D. x ? 24
Solve the variation problem.The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is required for a speed of 
per hour?
A. 168.07 feet B. 168.41 feet C. 180.37 feet D. 144.06 feet
Solve the problem.The number of cows that can graze on a ranch is approximated by C(x,y) = 9x + 5y - 8, where x is the number of acres of grass and y the number of acres of alfalfa. If the ranch has 75 acres of alfalfa and 90 acres of grass, how many cows may graze?
A. 1177 cows B. 1117 cows C. 1185 cows D. 1125 cows