-4 - (-13) =

What is the difference?

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Aflower has 26 chromosomes. to create a new flower, how many would a sperm cell have what is called?