Determine if the sequence is arithmetic-20,180,380,580, and if it is find the common difference and the recursive formula next/now equation

Find the length of cu, the triangles are similar.

What are the possible rational zeros of [tex]f(x) = x^4+2x^3-3x^2-4x+18[/tex]

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?