To estimate round each number to the closest whole number
7.8 would round to 8
307 would round to 300
8 x 300 = 2400
The answer would be c 2400
871,000 is the answer. It would've said the nearest ten thousand but you need to find the nearest "thousand". Try to be careful for these questions. They can be tricky.
P = L + L + w + w
72 = 2(L) + 2(L-4)
Distribute
72 = 2(L) + 2(L) - 8
Add like terms
72 = 4(L) - 8
Subtract 8 from both sides
64 = 4(L)
Divide both sides by 4
16 = L
The length is 16. Now substitute that in the equation for finding w.
w = L - 4
w =