Aparticular english class has 40 students. as the students leave the room, only 28 students are left after 3 seconds. what is the rate of change of the number of students in the classroom each second? -4 students per second 4 students per second 12 students per second -12 students per second

answer rather than having to add and subtract the measurements of the semi-circle, notice that the semicircle to the left of ad is actually identical in area to the blank semicircle-shaped space to the left of bc. so if we transferred the red semicircle into the blank space, we would end up with a square of side length 24 cm. the area of a square is s^2 = 24^2 = 676 cm^2.

u also answered this so i think u would know but i am here to

put in or use mine