1.Identify the mistake in the problem below. Then, correct the mistake. p-21=34
p-21-21=34-21
p=13

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

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Ineed if you could explain and give me the answer you! this needs done