The sum of Ken's, k, and Alan's, a, ages is 62. Ken is 31 years older than Alan. Which of these systems of equations below best describes the ages of Ken and
Alan?

What is the measure of angle tvu shown in the diagram below

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

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