Which two square roots are used to estimate 47

Which of the following represents the range of the graph of f(x) below

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 is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)