Multiply. just multiply the decimals. ?

Hey am have account in but wished to create an account here you guys will me with my make new friends of uk !

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

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.