Coefficients are the numbers that go in front of a variable. If the equation is 3z²-z+7, then the coefficients are 3 and -1. 3 is the coefficient for z² and -1 is the coefficient for z.
Hope this helps!
I think that would be 150%, as half of 2 is 1, and 2+1 =3. Therefore three is 1 and 1/2 of 2.