Can someone just explain what i need to do? i'm so confused the length of a text messaging conversation is normally distributed with a mean of 10 minutes and a standard deviation of 4 minutes. what is the probability that a conversation lasts longer than 20 minutes?

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.