Lol someone reported me cuz i didn't give them brainliest xD

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Can someone me with my math problems i have a bunch. i will give brainliest and lots of pleeeaaasssee

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.