Jack baked 38 biscuits. he can store them in boxes of 10 biscuits or as single biscuits. what are all of the different ways jack can store the biscuits?

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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?