If I buy 20 LEGO bricks, it costs $4.20If I buy 55 LEGO bricks, it costs $11.55If I buy 100 LEGO bricks, it costs $28.10(1) Find a linear function that closely models the data. (2) What are the units of measurement on the slope of the line? (3) What are the unit of measurement of the vertical intercept?(4) What is the contextual pneaning of the slope?