Consider the problem of finding the line of symmetry and vertex of the quadratic equation f(x) =x^2-8x+15 what is the error in the solution below?
x^2-8x+15=0 x=-8/2 =-8/2=-4 line of symmetry
8^2-8x+15=0 (-4)^2-8(-4)+15=0
16+32+15=0 y=63
(-4,63) vertex
a. the solution is correct.
b. the line of symmetry should have been 4 instead of –4.
c. the vertex is incorrect; it should have been {–4, 53}.
d. -4^2 should have been squared as –16 instead of 16.

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

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