Please help me I always sleep late doing homework and I do not want to today begging ya. You don’t have to do 1,2,3

What is the probability of rolling a single die greater than 4

Precalculus question, image attached.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?