You have 1 case of soap bars and there are 150 bars in a case. you use 300 bars of soap per day. how many cases do you need to order to have enough for 7 days? *

10% of 1,900,000. show me how you got the answer

Can someone tell me if this is perpendicular? !

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?