Check my answers?

Question

Check my answers?

anonymous · Answer

@whpalmer4

anonymous · Answer

@ganeshie8

anonymous · Answer

@dan815

abdullah1995 · Answer

going through it, give me 2 mins please :-)

anonymous · Answer

ok ty! :)

abdullah1995 · Answer

alright so for part a, the question is asking you the following things:
1. Name two things which are cube but different in size
2. Total volume of the two cubes as a sum

You did answer part 1 by saying that one cube can be a shoe box and the other can be a bird cage, however i see some stuff that is not required, such as 18 inch, 3 inch and other dimensions.

abdullah1995 · Answer

and then you wrote the expression 8a^3 + 2b^3 which is correct. for part A i think this is how it should look like http://prntscr.com/8hzysx

abdullah1995 · Answer

Part b is correct.  Just noticed that for part (a) you forgot to write b in 27b^3, so fix that.

anonymous · Answer

the part u have put a red line over. should i not write that?

abdullah1995 · Answer

yes don't write that. The question does not require that information

anonymous · Answer

oh ok Thank u :)

abdullah1995 · Answer

As far as i can see, part c does not correct.

If you notice $$(2a+3b)(4a^2-6ab+9b^2) = 8a^3+27b^3$$

So instead of putting a and b values in the factored form, just put them in the original equation which will be a lot easier to calculate

abdullah1995 · Answer

$$(8*3)^3+ (27*5)^3 = 2474199$$

anonymous · Answer

Oh ok. Tysm!

abdullah1995 · Answer

no worries. If you don't understand anything just tag me here or send me a private msg. Good luck with your homework out there ! :-)

anonymous · Answer

thnx!