Why is picking a cencus better than picking a sample when conducting a survey

What is the missing constant term in the perfect square that starts with x^2 -20x

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62