What is the sum of the finite arthemetic series (-10)+0+10++130

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.

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