Refer to the following normal curve, with mean ? and standard deviation ?.
If the standardized value of x is 0.5, then x =
A. 120.
B. 137.
C. 100.
D. 80.
E. none of these
Answer: A
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Find the numerical value of the expression for 
and 
3x2 + 8x
A. a) 80 b) 1116 B. a) 56 b) 252 C. a) 16 b) 828 D. a) 44 b) 198
Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where c is the cost in dollars, and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 39 watches B. 61 watches C. 40 watches D. 30 watches
Factor the sum or difference of two cubes.343x3 + 729
A. (7x + 9)(49x2 - 63x + 81) B. (7x + 9)(49x2 + 63x + 81) C. (7x - 9)(49x2 + 63x + 81) D. (343x - 9)(x2 + 63x + 81)
For the triangle described below, solve for B.
?
Apply the rules regarding the use of significant digits after all computations are complete.
?
ft, 
ft
?
A. 
B. 
or 
C. 
D. 
or 
E. no solutions