What is 3 divided by 7 pretty confused since I was on break for a long time

Louis wants to carpet the rectangular floor of his basement. the basement has an area of 864 square feet. the width of the basement is 2/3 it's length. what is the length of louis's basement

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

About 9% of th population is hopelessly romantic. if 2 people are randomly selected from the population, what is the probability that at least 1 person is hopelessly romantic?