W = L - 7
WL = 78
(L-7)L = 78
L^2 - 7L - 78 = 0
Factorize: (L-13)(L+6) = 0
L = 13 or -6
A length cannot be negative, so the length must be 13 miles.
The width is 13-7 = 6 miles.
WEll FIRST IT WRONF THEN IT IS
Da answer is 21,000 Pounds Couse 9 + 10 = 21
