What is 2 times 2?
Thanks if you would or could help its for math class

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

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.