Find the sum of the first 206 natural numbers

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

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?

The function show two sisters' savings account and the rate at which they plan to deposit money