You can put this solution on YOUR website! To solve these, use the phrase "letter goes away and number comes to stay as follows:
k(x)=x+20
k(0) = 0 + 20 = 20
k(-17) = -17 + 20 = 3
k (-12) = -12 + 20 = 8
k(14) = 14 + 20 = 34
K (d+17) = (d+17) + 20 = d + 37