The price of an item has risen 156$ today. Yesterday it was 65$. Find the percentage increase

Which of the following best describes the figure?

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 volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2