Is the simplified form of 2 square root of 3 minus 2 square root of 3 rational?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

To finance her community college education, sarah takes out a loan for $2900. after a year sarah decides to pay off the interest, which is 4% of $2900. how much will she pay

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.