2/3 * 1/2+ 3/4 /1+ 1/6

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

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

It says factor each expression 49x-28?