I am thinking of a number

When I subtract 13 and multiply by 9, I get 36

Whats my number

Answer fast!!!

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

Can you simplify 4/7? 24 points will be awarded!

Prove that quadrilateral is a rhombus.