Can someone explain how to find this answer

Explain how to graph a scatterplot and its regression line using a regression calculator.

Step by step explanation pls for 10 pts the length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?  

Tiny's tattoo parlor sold 389389 tattoos this month. 4343 of those tattoos were arm tattoos. based on this data, what is a reasonable estimate of the probability that the next customer does not get an arm tattoo?