Trica has 5/6 hour before she has to go to bed how much time can she spend reading before she goes to bed

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

This is different from the first one can someone me

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?