FIND THE SURFACE AREA PLEASE!

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

Lana's family entered a 5-kilometer race lana's average step length is about 0.5 meter how many steps will she need to take the finish