Elon and Rachel want to find 28.25 + 0.7. Elon says you should multiply the dividend and the divisor by 10 before dividing. Rachel says you should multiply
the dividend and the divisor by 100 before dividing. Who is correct? Explain.

btw hows your day?

answer: 5100 just subtract

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