Determine the approximate length of the segment AD

I need help asap!!!

Average acceleration: i have no idea how to do this.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Will mark brainliest for correct answer! i have been on this problem for an hour and can't find the answer. i'm begging here! incase you cant read the instructions in the picture because of too much or too little lighting: note: enter your answer and show all the steps that you use to solve this problem in the space provided.write a list of steps that are needed to find the measure of b. provide all steps as clear as possible, !