What is the value of x in the equation x – y = 30, when y = 15?

What is the total surface area of this square pyramid?

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?

Mr. walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?