Can someone also help me with this one? Thank you very much!

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

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

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have