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Or do you want me to tell you how to do this on a TI-83/84?

I have no idea how to do any of these..:/

Do you have a graphing calculator?

Nope...

the link I put is a picture of the graph--you can use it to do the estimation they are asking for.

http://0.tqn.com/d/create/1/0/i/9/9/-/Quadratic.formula.jpg

a=5
b=-3
c=-9
Plug them in and you'll get two answers for x. Both y-values will be 0.

(-(-3) +/- sqrt((-3)^2 - 4*5*(-9)))/(2*5)