Sandi buys 2 fewer packages of pencils than p packages of pens. pencils costs $2.45 per package and pens costs $3 per package. what does the expression 3p + 2.45(p − 2) represent? the expression 3p + 2.45(p − 2) represents the a. total cost of pens and pencils b. cost of pens c. number of pens and pencils d. cost of pencils