I am not sure if i understand
To get the answer you need to find out how many miles she bikes in 10minutes.
Divide 50minutes by 10 you get 5. Now you divide 10(miles) by 5 and you get 2. So it means that in 10minutes she bikes 2miles. Now you need to know how many miles she bikes in 90minutes so if she bikes 2 in 10 then because 90:10=9 you do 2*9=18. She can bike 18miles in 90minutes. :))
??? Google translate ???
También hablo poco español, es más mejor porque ni no se que estás diciendo jajajaja.
Only 19 is a function because a function only has one y value for every x value. For the other graphs, there are at least two y values for each x value.
