Please help qwic beginners algebra

Dont worry about the sations

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

What is the value of the expression below? 148+(-6)| + |– 35= 7|

How to find the exponential function y=ca^x, with points (1,2) and (2,1)