TKK Products manufactures electric light bulbs in the 50-, 60-, 75-, and 100-watt range. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 760 hr and a standard deviation of 60 hr.
0.1587; 0.0228; 0.3413; 0.7258
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Solve the problem.An auto mechanic finds that the interval time I, in minutes, between scheduled appointments must be related to the total number of minutes T that he is open each day and the number of scheduled oil changes N according to the formula 
If he wants to be open 9 hours each day, and feels that he can do each oil change in 20 minutes, how many appointments should he make in one day?
A. 2 B. 29 C. 145 D. 0
Write the English phrase as an algebraic expression. Let x represent the number. Simplify the expression, if possible.Three times a number decreased by 7
A. 
B. 3x - 7
C. 3 - 7x
D. 3x + 7
Solve.Given that sin ? = 
and that the terminal side is in quadrant II, find 
A. 
B. 
C. - 
D. - 
Solve the equation.
= 
A. 
B. 
C. 
D. {-135}