How do you write:
42 decreased by twice a number
in algebraic expression WILL REWARD MEDAL

- lilai3

How do you write:
42 decreased by twice a number
in algebraic expression WILL REWARD MEDAL

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- RadEn

42 - 2x (in x)

- lilai3

please explain

- lilai3

why isn't it 2x-42?

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## More answers

- RadEn

that's just a translater from words to expression algebraic

- lilai3

oh. what if it says...
the sum of the cube of a number and 12.... is it n^3 +12?

- RadEn

if it says :
42 decreased "from" twice a number, yeah it is 2x - 4
the sum of the cube of a number and 12, yeah you are right it is n^3 + 12

- RadEn

* 2x - 42 i mean

- lilai3

oh. thank you very much.

- RadEn

you're welcome

- lilai3

also, i have one more problem

- lilai3

name the property used in each equation. then find the value of n.
7y+y=7y+ny

- RadEn

im not sure is the answer " reflexive or symmetric property" im forget this, sorry :)

- RadEn

@rizwan_uet , you know this ?

- lilai3

oh.at least you told me one of the,. thanks. i thought it was commutitive.. LOL. uhm... what is n?

- anonymous

isnt it obeys distributive property??? @RadEn

- RadEn

a+b = b+a (it is commutative)
a(b+c) = ab + ac (it is distributive property)

- lilai3

so is it reflexive, since symmetry it has to be 7y+y=ny+7y, but it's not... so is it reflexive?

- anonymous

if we take y common on both sides we get
y(7+1) =y (7+n)
now using distributive property on each side we get
7y+y=7y+ny

- lilai3

i don't get it....

- RadEn

me too, haha...

- anonymous

you have this equation
7y+y=7y+ny
now some property of real number was applied to a certain equation to get
7y+y=7y+ny
my guess was that the equation was in this form
y(7+1) =y (7+n)
now applying distributive property in both sides we get
7y+y=7y+ny
sorry for my weak english LOL

- lilai3

lol. it wasn't weak. :P
...but then what is n? because you have to find the value of that.... is it 1? or not... idunno

- anonymous

7y+y=7y+ny
the only value that n can hold is 1 to get both sides similer of the above equation

- lilai3

so i'm right?
it's distributive and 1?

- anonymous

for the value of n you are absolutly right but for distributive property it was my state of arguments

- lilai3

oh. okay...
can you also do another problem...let's say(random):
(6+n)x+15x

- anonymous

(6+n)x+15x
using multiplicative property property we get
x(6+n)+15
now using distributive property
6x+nx +15x

- lilai3

why did you add 15 x to the equation?

- anonymous

its the part of equation

- lilai3

then where's the equal sign?

- anonymous

hmm wait

- lilai3

okay

- anonymous

(6+n)x+15x
using multiplicative property property we get
= x(6+n)+15x
now using distributive property
= 6x+nx +15x

- anonymous

does this make sense now??

- lilai3

yes, so it is distributive property, and the n is 9, right?

- anonymous

basically you wrote this at first
(6+n)x+15x
now its not an equation until you mention some equality sign here
now you cant find n in the absence of equality sign

- anonymous

sorry i lost internet connection

- lilai3

it's alright, and thank you!

- anonymous

welcome

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