Answer:
The length is 32 cm
Step-by-step explanation:
The scrapbook is rectangular so the perimeter is 2(l+w)
P = 2(l+w)
We know the perimeter is 154 and the width is 45
Substituting these values into the equation
154 = 2 (l+45)
Divide each side by 2
154/2 = 2/2 (l+45)
77 = l+45
Subtract 45 from each side
77-45 = l+45-45
32 = l
The length is 32 cm
