Surds question

simplify fully the square root of 25/16
simplify fully the square root of 18 over the square root of 8

Can someone me do math because i am having a breakdown rn because i don’t get it

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd

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.