Onur is participating in a walkathon fundraiser. two donors promised to donate money based on the total distance he walks. the money, a , in dollars, that he receives from the first donor given that he walks d kilometers is given by the formula a ( d ) = 10d. the money, b , in dollars, that he receives from the second donor given that he walks d kilometers is given by the formula b ( d ) = 2 d + d 2. let t be the total money that onur raises from those donors by walking d kilometers in the walkathon.