The amount of time a certain brand of light bulb lasts is normally distributed with a mean of 800 hours and a standard deviation of 50 hours. What is the probability that
a randomly chosen light bulb will last between 780 hours and 810 hours, to the
nearest thousandth?

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet

i don't know, but that looks pretty bad. my school passed us unless we failed in all the subjects, but idk abt ur school's rules.

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