In morning emily studied 40 minutes for a math exam. later that evening emily studied for x more minutes. write an equation that represents the total number of minutes y emily studied for the math exam.

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

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?