Answer :
First, calculate are of one paper
area = l × w
area = 9 × 10
area = 90 in²
Second, calculate area of 4 papers
area = 4 × area per paper
area = 4 × 90
area = 360 in²
Total area of Erica's banner is 360 in²
area = l × w
area = 9 × 10
area = 90 in²
Second, calculate area of 4 papers
area = 4 × area per paper
area = 4 × 90
area = 360 in²
Total area of Erica's banner is 360 in²