This is my Algebra homework, please help. I will mark Brainlest

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)