The histogram below shows the number of sit-ups accomplished by 6th grade students in a physical fitness test. how many students accoplished at least 30 sit-ups

If a =6, what is the value of 2a(3b + 5c)?

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

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