Express as a single logarithm and, if possible, simplify.loga10,000 - loga 100
A. loga 100
B. 100 loga 10,000
C. loga 9900
D. loga 
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 500 hours and 675 hours
A. 4,700 B. 2,300 C. 4,800 D. 2,256
Find a system of inequalities to describe the given region.Points in the first quadrant whose distance from the x-axis is less than 3 units
A. x > 0, y > 0, x < 3 B. x > 0, y > 0, x2 + y2 < 9 C. x > 0, y > 0, x < 3, y < 3 D. x > 0, y > 0, y < 3
Simplify the expression. Assume that all variables are positive when they appear.
A. 2
B. 2
C. 
D. 
Write out the sum.
A. 5 + 9 + 13 + ... + (4n + 5) B. 9 + 13 + 17 + ... + (4n + 1) C. 5 + 9 + 13 + ... + (4n + 1) D. 9 + 13 +17+ ... + (4n + 5)