Answer:
(D)
Step-by-step explanation:
It is D (even though I can't see it) because A, B, and C are not the graphs of radical functions.
Hope this helps :)
Let 
be the inital number of Timmy's marbles, and 
be the inital number of Ben's marbles.
At the beginning, "Timmy had 3/4 of what Ben had", which means
(I wrote the equation in an equivalent form to avoid denominators)
Then, Ben gives 36 marbles to Timmy. So, now Ben has 
marbles, and Timmy has 
marbles. The new ratio is 1 to 3 in Timmy's favour, so we have
(same as before)
So, we have the following linear system:
From the first equation we know that 
, so the second equation becomes
Now that we know the value for , we can simply plug it into the first equation to get
Answer: When we add or subtract rational numbers that have the same denominator, we add or subtract only the numerators. The denominators stay the same. When we add or subtract rational numbers with unlike denominators, we need to change the rational numbers to equivalent rational numbers that have the same denominators, before we find the sum or difference. Adding & Subtraction Rational Numbers
Step-by-step explanation:
