Sarah went up an escalator, then took the stairs back down. Graph time on the x-axis,
then distance traveled on the y-axis.

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

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