Nancy goes to the Post Office to exchange money. (Exchange rates: £1 = $1.31 , £1 = €1.14). Nancy changes $759.80 and €342 into pounds sterling. The post office deducts their commission and gives Nancy £827.20.
What is the percentage commission?

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

1.) 21

2.) 0.453

3.) 1.5

4.) 48

5.) $ 22

step-by-step explanation:

might be the correct answer will be question number 2