Subtract 8x-8y+9 from 5x-8y-z

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?

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.