The variable p represents number of presents. If it takes 10 feet of ribbon to make 1 bow on a present and 3 feet is used to practice trying the bow, the expression 10p + 3 can be used. If there are 7 presents, how much ribbon is needed? Ribbon is sold in 15 feet packages. How many do you need to buy?

The number of ribbons needed is 73The number of ribbons to buy is 109. 5 What is a function?A function can be described as an expression or rule that explains the relationship between two main variables in an equation.These variables are called;Independent variableDependent variableWe have the expression;N = 10p + 3Where 'p' represents the number of presents N is the number of ribbons Now, let's substitute the value of p as 7N = 10(7) + 3N = 70 + 3N = 73 ribbonsIf 10 feet = 73 packages15 feet = xcross multiplyx = 73(15)/10x = 109. 5 ribbonsHence, the value is 73Learn more about functions here:https://brainly.com/question/25638609#SPJ1