Will give brainliest I need help simplifying this problem:
We're working on stretching and compressing functions, and honestly, I don't get it, so if someone could explain how to do this problem, I'd really appreciate it :)
C(t)= -0.3(t-12)^2+40
C(12)= -0.3(12-12)^2+40

Thank, ily!

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

How to do this , and can some one explain

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much