I need help. Me and my friend are arguing is it pronounced math or maths. first to tell me gets 20 points

Find the solution of system of equation y= x-4 y=4x+2

What are the solutions to the equation 4x2+3x=24-x

Which is the correct first step in finding the area of the base of a cylinder with a volume of 26x cubic meters and a height of 6.5 meters? v=bh 6.5=b(26x) v=bh v=26pi+(6.5) v=bh v=26pi(6.5) v=bh 26pi=b(6.5)