Hey people can sum one help me with this question question- what is the sum of 2 2/3 and - 2 2/3

Which graph represents 2x-5y< 15

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

Shane can shovel the driveway in 4 hours, but if his sister it would take 2 hours. how long would it take taylor to shovel the driveway alone