Byyyeee guys I'm leaving forever!

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

One positive number is 9 more than twice another. if their product is 95, find the numbers

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.