Please paste the answer choices next time....
The expression should include a variable for marias age compared to a variable for her fathers
Something like
M=1/3F
M being maria's age and F being her fathers age
The answer is 35 so that's it
The third equation is correct. The easiest way to solve a problem like this is to plug the x-values from the chart into the equations and see which one equals the y-value in the chart.