Given a = {a, b, c}, how many subsets does a have including ∅?
a. 4
b. 7
c. 8

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

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?