Hewo can smart people answer my questions.. it would be much appreciated

Combine like terms7y^2 + 7(6y^2 − 8)

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

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.