Juan texts 20 messages in 5 minutes. At this rate how many text messages can he send in 30 minutes

Geometry answer picture question pls . reason and statements

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?