You are given the numbers √1,815 and √3,025. are the numbers rational?
a. only √ 1,815 is rational
b. only √ 3,025 is rational
c. both numbers are rational
d. both numbers are irrational

A rational number is an integer that either doesn't have a decimal or has a decimal that either repeats or terminates (ends). Basically, if these square roots come out to be an integer, they're rational. 
The first one comes out to be 42.6028168083, so obviously not rational.
The second one comes out to be 55, so it is rational.
B is your answer.

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