The total area of wisconsin is 65498 square miles. of that, about 80% is land area. about how many square miles of wisconsin is not land area?

13,100 mi²

Step-by-step explanation:

If 80% of the area of WI is land area, then that area is 0.80(35,498 mi²).

If (100% - 80%), or 20%, is not land area, then that area comes to

0.20(65,498 mi²), or 13,100 mi² (rounded up from 13,099.6).

hello from mrbilldoesmath!

answer:   (7x + 6y) ( 49x^2 - 42xy + 36y^2)

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

(7x + 6y) ( 49x^2 - 42xy + 36y^2)

you,

mrb

(a + b) (a^2 - a b + b^2)