Select all of the following that are quadratic equations.

x^2-2x=4x+1
x^3-6x^2+8=0
5x-3=0
2x^2+12x=0
5x-1=3x+8
9x^2+6x-3=0

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.

Tell whether the two rates form a proportion

What is the least common multiple for 6 and 8? what is the least common multiple for 4 and 12 ? what is the least common multiple for 11 and 12? what is the least common multiple for 3 and 6?