Use a determinant to find y such that (8, -20), (16, y), and (20, -8) are collinear.
A. y = -12
B. y = 20
C. y = -44
D. y = 4
E. y = -8
Answer: A
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A company installs 5,000 light bulbs. The lifetimes of the lightbulbs are approximately normally distributed with a mean of 500 hours and a standard deviation of 100 hours. Find the approximate number of bulbs that can be expected to last the indicated amount of time.Between 540 hours and 780 hours
A. 2,215 B. 1,717 C. 2,217 D. 1,710
Solve the quadratic equation by completing the square.x2 - 14x + 45 = 0
A. x = 40, x = 5
B. x = 
, x = 
C. x = 9, x = 5
D. x = -9, x = -5
Solve the problem.Below is a summary of gas charges from an electric and gas company. Find the total charges if 46 therms were used in one month. 
A. $74.56 B. $64.56 C. $69.56 D. $143.50
Find the domain of the rational function.f(x) = 
A. all real numbers except 
B. all real numbers except - 
C. all real numbers except 
, 1
D. all real numbers except 