Please help find the missing length

What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

Aline passes through 3,7 and 6,9 what equation represents the line

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd