Do you mean:

If so then:

...............

This last, do you mean:given y = 0.0909 + 0.00002x - 0.000000001x^2

solve: B = m*integral (from 100 to 500) of ydT

SORRY FOR INCONVENIENT TYPING

you seem to have a confusing set of variables in what you have written.

............

RonL