Lydia has 3.4 of a pizza. sandra has 1.2 of a pizza. how much pizza do they have altogether?

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.

Let f(x)=2x and g(x)=2x. graph the functions on the same coordinate plane. what are the solutions to the equation f(x)=g(x) ?me asap

If u good at math hit me up on insta or sum @basic_jaiden or @ and