Aditi is participating in a walkathon fundraiser. two anonymous donors agree to donate money according to the distance she walks. the money, aaa, in dollars, that she receives from the first donor for walking ddd kilometers is given by the formula a(d)=12da(d)=12da, left parenthesis, d, right parenthesis, equals, 12, d. the total money, ttt, in dollars, that she receives from both donors for walking ddd kilometers is given by the formula t(d)=d^2+20dt(d)=d 2 +20dt, left parenthesis, d, right parenthesis, equals, d, start superscript, 2, end superscript, plus, 20, d. let bbb be the money that aditi receives from the second donor for walking ddd kilometers. write a formula for b(d)b(d)b, left parenthesis, d, right parenthesis in terms of a(d)a(d)a, left parenthesis, d, right parenthesis and t(d)t(d)t, left parenthesis, d, right parenthesis. b(d)=b(d)=b, left parenthesis, d, right parenthesis, equals write a formula for b(d)b(d)b, left parenthesis, d, right parenthesis in terms of ddd. b(d)= b(d)=b, left parenthesis, d, right parenthesis, equals