What is a rule for the sequence below?

1.8, 2.85, 3.90, 4.95, 6

Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept

Can some one me with these questions