Help pls show work if needed also WILL GIVE BRAINLIST IF U GUVE BOTH PARTS

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip

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

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?