Annie enjoys going to the beach to look for shells. On Saturday, she found 4 times as many shells as she found on Sunday.
If Annie found 21 more shells on Saturday than on Sunday, how many shells did she find
altogether over the weekend?
shells

Fiona and her friends are playing a game by guessing where a coin will land when it is randomly dropped inside the square shown below. fiona guesses that the coin is likely to land in the blue area. which explains whether or not fiona is correct and why?

Evaluate cos2θ for cosθ = square root of 3/2

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?