To check if 2 ratios are equivalent, we divide both of them and see what we get, lets try it out:
[tex] \frac{9}{2} = 2.25[/tex]
Now, lets try the other that we are comparing
[tex] \frac{11}{4} = 2.75 [/tex]
Therefore, these ratios are not equal.
Simply enter the value into the calculator (as a fraction) then see what decimal it gives, record it, if you get the same decimal value then you know whether if it is equal or not.
Now apply this to the rest of your homework, good luck!