Need friends plzz ima girl btw im 14

Solve the system of equations. y= 2x y= x^2 - 15

Find the value of x that will make l ll m

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2