Question

The length of a rectangle is fixed at 21 cm. What widths will make the perimeter greater than 82cm?

Answer 1

P > 82 cm
P = 2l + 2w
2l +2w > 82 cm
2(21 cm) + 2w > 82 cm
42 cm + 2w > 82 cm
2w > 40 cm
w > 20 cm

ANSWER: width > 20 cm

Answer 2

2x + 42 > 82 [2x represents the width, 42 the two lengths]
2x > 40
x > 20

Answer 3

2w+2l>82
2w+42>82
2w>40
w>20
the widths that will make the perimeter >82 is when w>20

Answer 4

do I need to include the > sign with the answer

Answer 5

Definitely!