The life expectancy of a fluorescent tube is normally distributed with a mean of 5,800 hours and a standard deviation of 800 hours. Find the probability that a tube lasts for more than 7,400 hours. Use the Empirical Rule.

a.  0.8410
b.  0.4770
c.  0.5230
d.  0.1590


d.  0.1590

Mathematics

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Find the indicated coordinates.(4, -2) is the vertex of the right angle of an isosceles right triangle. (2, -2) is a second vertex of the triangle. What are the coordinates of the third vertex?

A. (4, -4) B. (2, -4) or (2, 0) C. (4, -4) or (4, 0) D. (2, -4)

Mathematics

Integrate the function.

A. tan-1  - tan-1 
B. sin-1  - sin-1 
C.  tan-1  -  tan-1 
D.  tan-1 

Mathematics

Perform the indicated operations and simplify the expression. ? ?

A.
B.
C.
D.
E.

Mathematics

The graph of a function is given. Determine whether the function is increasing, decreasing, or constant on the given interval.[-1, ?)

A. constant B. increasing C. decreasing

Mathematics