Exercise 2 Page 244

Let's take a look at the expression that represents the cost to buy p pounds of potatoes at $0.32 per pound and n pounds of onions at $0.48 per pound. 0.32 p+ 0.48 n We want to find out how much it will cost to buy 4.5 pounds of potatoes and 2.5 pounds of onions. We can do this by substituting 4.5 for p and 2.5 for n in the expression and simplifying. Let's do it!

0.32p+0.48n

SubstituteII

p= 4.5, n= 2.5

0.32( 4.5)+0.48( 2.5)

Multiply

Multiply

1.44+1.2

AddTerms

Add terms

2.64

It will cost $2.64 to buy 4.5 pounds of potatoes and 2.5 pounds of onions.