What is 1/4 of 16 please help​

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

What expression is equivalent to 42x-56y

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.