ILL BRAINLIEST YOU PLEASE HELP ME

Remember SohCahToa

For this let's use sine.

SinA = opposite/adjacent

SinA = x/c

We know c = 8 and A = 21

Sin21 = x/8

x = (sin21)8

Put that in the calculator:

hope this helps :D

about 0.75 hours

step-by-step explanation:

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