A small class of 8 students took a quiz yesterday, and their scores are below. Find the percentile for Justin if his score was the 87. 77 , 64 , 93 , 76 , 61 , 82 , 94 , 87

the correct answer is the second option

what was there favorite food

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