White 4x+y=8 in slope intercept form

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

Evaluate the following expression 1/3^2

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9