What is the value of x in the equation -2/5x=2/5

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

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Select all the expressions that will include a remainder.