What is 3/16 as decimal

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

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?