HELP! Can anyone solve these with work?

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1

Your friend, taylor, missed class today and needs some identifying solutions to systems. explain to taylor how to find the solution(s) of any system using its graph.