4. A cell phone company charges $50 for the
phone plus a monthly service charge of $30.
The equation y = 30x + 50 gives the cost y
after x months. Which is true of the relationship
between x and y?
A. It is linear and proportional.
B. It is linear and nonproportional.
C. It is not linear.
n. It is not linear and proportional,

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?

Which one ? is the answer and how to find this answer

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?