Write as equivalent fraction with the lcd 1/20 and 21/50

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?

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?