Perform the indicated operations and simplify the result. Leave the answer in factored form.
+ 
A. 
B. 1
C. 
D. 
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
Use the vertex and intercepts to sketch the graph of the quadratic function.f(x) = (x - 5)2 - 6
A. 
B. 
C. 
D. 
Solve the problem.A company has sales (measured in millions of dollars) of 50, 60, and 75 during the first three consecutive years. Find a quadratic function that fits these data, and use the result to predict the sales during the fourth year. Assume that the quadratic function is of the form y = ax2 + bx + c
A. y = 
x2 + 
x + 45; sales during the fourth year = $95 million
B. y = 5x2 + 5x + 40; sales during the fourth year = $180 million
C. y = -5x2 + 40x + 15; sales during the fourth year = $95 million
D. y = 
x2 - 
x + 
; sales during the fourth year = $151.25 million
Identify the fraction as a proper fraction, an improper fraction, or a mixed number.
A. Proper fraction B. Mixed number C. Improper fraction