What is the square root of n/25?

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?

Charlie tosses five coins.what is the probability that all five coins will land tails up.