Due soon please help me3

What is the smallest integer n such that n\sqrt{2} is greater than 20

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?