Answer:
b=3in
Step-by-step explanation:
SO first of all, the formula for area is lxw (length x width)
And our question tells us that
l x w=24in^2
4 x w = 24 (question tells us that length is 4 inches as listed on side)
4 x (b+3) = 24 (b+3 is the total width of the postcard)
4b + 12 =24 (multiply by 4 inside the bracket)
4b=12 (subtract 12 from both sides)
b=3 (solve for b by dividing by 4)
