验证下列方程为恰当方程，并给出求解过程。[tex=11.643x1.571]CxBFB7Q2I5TzOKPCLZ8WXd9dbtaVcNTnACGNHtpzy1vQGb8CZ8uewU5xS47/haKE[/tex]

Questions 17-20 are based on the following discussion about a survey result. What is the woman’s marketing strategies A: Target the 46 to 55 year-old age. B: Produce more athletic shoes. C: Sell tennis rackets. D: Hake people more health conscious.