How to simplify this so it equal to c

Bradley hikes 12 miles in 3 hours. in relation to bradley’s hike, which statement describes the expression

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

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.