HELP ASAP WITH THESE QUESTIONS!! GIVING BRAINLIEST

Plz. yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details