The mean of 100 numerical observations is 47.83. what is the value of the sum of all 100 numbers?

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

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?