400 students were surveyed about their
favorite vegetable. How
many students picked
carrots and zucchini as
their favorite?

What percent of the circle below is shaded?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

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?