Andy has won 12 out of the last 24 tennis matches he has played. if he wants to improve his win record to 70%, which equation could he use to determine how many matches he would have to win in a row? a) 12 + x 24 + x = 0.70 b) 24 + x 12 + x = 0.70 c) 0.70 24 + x = 12 + x d) 0.70 12 + x = 24 + x