A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. Find the approximate number of bulbs that can be expected to last the specified period of time.Between 540 hours and 780 hours
A. 2217
B. 1710
C. 2215
D. 1717
Answer: B
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. (72)-1
A. 
B. - 
C. -14
D. -49
Simplify the rational expression.
A. 
B. 
C. 
D. 
Write an algebraic expression for the specified quantity.A merchant has light roast coffee worth $6.50 a pound that she wishes to mix with dark roast coffee worth $9.99 a pound. Let x = the number of pounds of dark roast coffee in a 50-pound mixture of light roast coffee and dark roast coffee. Write an algebraic expression in x for (i) the number of pounds of light roast coffee in the 50-pound mixture; (ii) the value of the dark roast coffee in the 50-pound mixture; (iii) the value of the light roast coffee in the 50-pound mixture.
A. (i) 50 + x (ii) $9.99(50 + x) (iii) $6.50x B. (i) 50 + x (ii) $9.99x (iii) $6.50(50 + x) C. (i) 50 - x (ii) $9.99(50 - x) (iii) $6.50x D. (i) 50 - x (ii) $9.99x (iii) $6.50(50 - x)
Use a graphing utility to graph the function over the indicated interval and approximate any local maxima and local minima. If necessary, round answers to two decimal places.f(x) = x2 + 2x - 3; (-5, 5)
A. local maximum at (1, -4) B. local minimum at (1, 4) C. local minimum at (-1, -4) D. local maximum at (-1, 4)