Given that y is inversely proportional to x, and y = 5 when x = 7, find the value of x when y = 70

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

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?

Find the value of x in the diagram below. select the best answer from the choices provided