Please help. A sum of money was shared among A, B and C in the ratio of 6 : 5 : 22. A and B spent $288 each while C spent $576. B then found that he had spent of 3/4 of his money.
Express in the simplest ratio, the amount of money A, B and C had left.

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

(a) x intercepts: -6 and 2

you can obtain these by solving the equation 0=x^2 +4x-12 using your favorite quadratic formula. but it is easy to verify -6 and 2 indeed satisfy this equation.

(b) y intercept: -12

this is obtained by setting x=0: 0^2+4*0-12 = -12

(c) the minimum value is: -16 (this is the vertex)

you can get the vertex by rewriting the equation into the form:

there is no global or local maximum as the function goes to infinity, so only in the limit sense: +infinity.