What is the LCM of 12 and 15

With #! i’ve tried to figure it out but i can’t.

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

Acircle has a circumference of 7.850 units. what is its radius?