n order to plant a tree, robin begins by digging a hole at a depth 2.5 feet below the fround's surface. Then she increases the depth by 1.6 feet. Where is the bottom of the hole now relative to the ground's surface?

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

step-by-step explanation:

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i hope this with your

the answer is c. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀