Subtract the quotient of 18 and 2 from sum of 22 and 9

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers