Write two inequalities to compare -2 and -18

What two criteria are needed for triangles to be similar

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Simplify. −4x^2 (5x^4−3x^2+x−2) −20x^6−12x^4+8x^3−8x^2 −20x^6+12x^4−4x^3+8x^2 −20x^8+12x^4−4x^2+8x −20x^6+12x^4+4x^3−8x^2