The price of an ice cream is 3.95 plus 0.85 for each topping t on the ice cream

Which is the focus of a parabola with equation y2=4x

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.