My grades are dropping and i need to bring them up! please match with the letter and number! :)

idk

step-by-step explanation:

do it yourself, cause that made me do it myself today, in english!

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

hello from mrbilldoesmath!

answer:

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

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

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

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb