Question

@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

Answer 1

@mLe

Answer 2

i am thinking D 2.25 x 10^-18

Answer 3

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

Answer 4

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

Answer 5

2.5 * 9 = 22.5 ;)

Answer 6

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

Answer 7

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

Answer 8

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

Answer 9

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

Answer 10

wait wait wait the answer's not D!

Answer 11

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

Answer 12

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

Answer 13

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

Answer 14

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

Answer 15

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

Answer 16

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

Answer 17

?

Answer 18

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

Answer 19

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

Answer 20

srry... i put it wrong just then lol

2.5 * 9 = 2.25

Answer 21

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

Answer 22

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

Answer 23

if you like counting zeros...

Answer 24

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

Answer 25

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

Answer 26

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.

Answer 27

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