For 1, you need to convert the blank spaces into either feet or inches (the top spaces will be feet and the bottom spaces will be inches).
2 is the same thing, except the top blank spaces will be inches and the bottom spaces will be feet. A ratio is a fancy word for fraction, in this case: inches over feet. To find what each ratio is equal to, divide the top number by the bottom number of each ratio, and that is your answer.
3 is also simple. Try not to overthink it! Make the equation y=. So, you want it to look like inches=a number of feet * feet. This is just what you use to convert feet to inches, if that makes better sense.
If you need more help on the equation, ask me. You can ask me if you got the correct equation if you would like. :)
Hope this helps!