What is the equation of the circle with center (1, −1) that passes through the point (5, 7)?
A) (x + 1)2 + (y + 1)2 = 36
B) (x + 1)2 + (y − 1)2 = 52
C) (x − 1)2 + (y + 1)2 = 80
D) (x − 1)2 + (y − 1)2 = 100

What is the volume of the sphere shown below with a radius of 3?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Can someone check if i did this correct. it’s number 4 if you’re wondering.