Answer:
300 percent change
Step-by-step explanation:
300 is 400 percent of 75.(75x4 is 300.) Therefore, the percent change is
400 - 100 = 300.
The area model you can use is D , cs 70 +3 & 30+9
![\qquad\qquad\huge\underline{{\sf Answer}}](https://tex.z-dn.net/?f=%5Cqquad%5Cqquad%5Chuge%5Cunderline%7B%7B%5Csf%20Answer%7D%7D)
Here we go ~
The air plane descends 15 feels every 1.45 seconds, so it's unit rate is :
![\qquad \sf \dashrightarrow \: \dfrac{15}{1.45} \: \: ft / sec](https://tex.z-dn.net/?f=%5Cqquad%20%5Csf%20%20%5Cdashrightarrow%20%5C%3A%20%20%5Cdfrac%7B15%7D%7B1.45%7D%20%5C%3A%20%20%5C%3A%20%20ft%20%2F%20sec)
Now we have to calculate the descent in 3.5 minutes ~
![\qquad \sf \dashrightarrow \: \dfrac{15}{1.45} \: \: \times 3.5 \times 60](https://tex.z-dn.net/?f=%5Cqquad%20%5Csf%20%20%5Cdashrightarrow%20%5C%3A%20%20%5Cdfrac%7B15%7D%7B1.45%7D%20%5C%3A%20%20%5C%3A%20%20%20%5Ctimes%203.5%20%5Ctimes%2060)
![\qquad \sf \dashrightarrow \: 2172.41 \: \: ft](https://tex.z-dn.net/?f=%5Cqquad%20%5Csf%20%20%5Cdashrightarrow%20%5C%3A%202172.41%20%5C%3A%20%20%5C%3A%20ft)
So, the airplane descends 2172.41 feels in three and a half minutes ~
The group with need to fill the spoon a total of 3 times this is because 1/8+1/8+1/8=3/8