Find the perimeter of the following shape rounded to the nearest 10th

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.