You are competing in a foot race. you are at point b (8,5) and the finish line is at point a (-5,5) how far are you?

In a probability experiment, karen flipped a coin 76 times. the coin landed on heads 32 times. what percentage of the coin flips resulted in tails? round to the nearest percent. a. 58% b. 65% c. 42% d. 60%

Icould really use some with this question.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?