Jacob's piggy bank has 18 quarters, 20 dimes, 24 nickels, and 43 pennies. He
chooses a coin, does not replace it, then chooses another. What is the
probability that he chose a dime then a nickel?

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?

An object in geometry with no width, length or height is a(n):

Abcd is reflected across the x- axis, then rotated 90 clockwise about the orgin, and finally reflected across the line y= x to form a’ b’ c’ .