NEED HELP ON TEST

Which of the following is a rational number?
a)square root 1
b)square root 2
c)square root 3
d)square root 5

Need ! easy 6th grade work! i will put as much points as i can! you so much! i’m learning this in math and it’s soo

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?