Prove angle DBC= 45 degrees

When only separate discreet points are graphed it is called?

In which form is the following function written? y = - 2(x – 3)(x + 5)

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