PLEASE HURRY

Can someone pls explain Pythagorean Theorem to me

Thank you

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.

Hello, i need compare km^2 and km. what's difference in this?