In a plan for area codes, the first digit could be any number from 3 through 8, the second digit was either 0 or 4, and the third digit can be any number but 0. with this plan, how many different area codes are possible?

Two parallel lines are crossed by a transversal. what is value of x

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

What is the solution to the equation below? 3/x-2+6=square root x-2 +8