9. Quadrilateral ABCD has vertices A(1, 3) , B(6, 10), C(8, 4) , and D(3, - 3) . Prove that ABCD is a parallelogram but not a rhombus.*

Answer this question only if you know the answer! 30 points and

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+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