Easy math question please help

Which of the following would represent the sum of 3 consecutive integers if x is the first integer?

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

Simplify. 3(4+4x) (type your answer in with no spaces)