The lifetime of a certain type of calculators is normally distributed. If the mean is 400 hours and the standard deviation is 50 hours, for a group of 5000 batteries, how many are expected to last 1.between 350 hrs to 450 hours
2.more than 300 hours
3.less than 300 hours

power property.

i think is g(1)=-1.

hope that i can

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

hello from mrbilldoesmath!

answer:   x^2 + y^2 = 1024

discussion:

the equation of a circle with center (h,k) and radius "r" is

(x-h)^2 + (y-k)^2 = r^2.

in our case

(x-0)^2 + (y-0) ^2 = 32^2 = 1024

you,

mrb