- anonymous

@mLe
What is the product in scientific notation?
(2.5x10^-8)(9x10^-10)
A. 2.25 x 10^19
B 2.25 x 10^-16
C. 2.25 x 10^-17
D. 2.25 x 10^-18

- chestercat

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- anonymous

- anonymous

i am thinking D 2.25 x 10^-18

- mLe

good guess but not quite
22.5 x 10^-18 would have been right
^ but as you can see, there's a little problem with the 22.5 instead of 2.25

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## More answers

- anonymous

the second part is confusing bc the 9 is not used ...wait would i do 9 x 10^-10?

- mLe

2.5 * 9 = 22.5 ;)

- mLe

10^-8 x 10^-10 = 10^-18

- anonymous

ahh... y must we learn things we will most likely nvr use :/

- mLe

don't jinx it >.> I thought that too, but here I am, teaching you ;P

- anonymous

gonna post the next one and i do mental math ...nvr really messed with a calculater so out of my realm of knowledge here...lol

- mLe

wait wait wait the answer's not D!

- anonymous

i will close this and post right away... it wants the standard form of what is shown in the "calculator"

- mLe

meowwww let's get this question right first xD
what's the answer to this question???
cuz it ain't D >.>

- anonymous

D. is the only one that seems to make sense tho...
2.25 x 10^-18
by elimination process it seems to b the only one that it could be
a... the ten to the power of positive 19... i do not see a way with the exponents to get that answer

- mLe

22.5 x 10^-18 is what you would get from multiplying it all
but that gets you 22.5 NOT 2.25
so move the decimal over ONE more and you'll get 10^-19

- anonymous

ok. i did not think of it that way. obviously my powers of scientific notation are slow at best lol ;3

- anonymous

totally lost. makes no sense when i try to break it into to and do each separately

- mLe

?

- mLe

2.5 times 9 = 22.5
10^-8 times 10^-10 = 10^-18
22.5 = 2.25 x 10^-1
so the original question = 2.25 x 10^-1 x 10^-18 = 2.25 x 10^-19

- anonymous

2.25 times 9 would be 2.25 tho bc u have to go 2 decimal places ...i thought

- anonymous

srry... i put it wrong just then lol
2.5 * 9 = 2.25

- anonymous

u r righ ... it would b 22.5 ...not getting that tho bc i thought u have to count ovr the decimal spacesand some how i found a new non-existant one ,,,wow

- anonymous

so if i write the exponents out as numbers would that be easier?

- mLe

if you like counting zeros...

- anonymous

yeah... not so much besides it confused me more

- anonymous

2.5 * 0.0000000011
for ome reason not thinking that is how to get the answer

- anonymous

i am thinking the answer is not there... just gonna do an educated guess and move on... just have entirely too much left to spend too much time on it.

- mLe

I'm telling yah that is it the one with the 10^-19

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