Complete the square to determine the minimum or maximum value of the function defined by the expression -x^2-4x+15

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

Acircus act has 3 times as many elephants as acrobats. jorge noticed that all together there were 56 legs in the circus ring. how many elephants were in the show?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse