What are the x and y intercepts

Which math sentence can be used to determine if the triangle is a right triangle?

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

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