Can someone please tell me how to solve this math question?

Topic: 100 case solving

May 21, 2019 / By Gwenda

Question:
I already have the answer but I do not know exactly how they came up with the answer for future questions and etc.
81 / 240 x 100 = 33.75 %
I have figure 81 divide by 240 = 3 in this case but when I X by 100 I get 300 and not 33.75. I know I am doing something very wrong. can you please explain.
Thank You in advance
Ok I got it, thanks everyone !
I was doing it backwards but got it down now, thanks again !

Originally Answered: I need help in these math problems can any1 solve and show me how to solve them?
0=x^2+2x-3 is a quadratic equation. It can be solved by completing the square, using the quadratic formula or by factoring the polynomial, which is the easiest way when the factors are obvious, as in this case.
0 = (x + 3)(x - 1) Since the product is zero only if one of the factors is zero, this gives two possible answers:
x + 3 = 0 or x = -3 and
x - 1 = 0 or x = 1
Quadratic equations may have two answers (or roots), one answer (actually two identical roots), and the roots may be real numbers or imaginary ones.
However, to find f(0), all you need to do is substitute 0 for x in the polynomial and evaluate the expression.

Originally Answered: I need help in these math problems can any1 solve and show me how to solve them?
2x + 2y = 20 making use of the simultaneous technique 2x - 2y = 4 ____________ 4x = 24 ( divide by skill of four) x = 6 replace x in considered one of the two equations 2x + 2y = 20 2 (6) + 2y = 20 12 +2y = 20 2y = 20 - 12 2y = 8 (divide by skill of two) y = 4 answer : X = 6 , Y = 4

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