Help me with this pls

The area of square garden is 300m squared. how long is the diagonal?

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

Which of the following points is a solution to the system of equations shown? y - x = -1 x + y = -5