Question

How many significant numbers does the difference 218.7201-218.63 contain? I have gotten the answer for the difference which is 0.0901, just confused on whether to round to the hundredths or not.

Answer 1

It has 2 decimal places, no you do not need to round off the one, but you need to keep the zero for some strange reason...
so the answer would be 0.090.

Answer 2

Okay. So therefore it would have 2 significant figures?

Answer 3

Yeah 2 sig figs

Answer 4

Okay, can you help with a few more if you have time? its for a test im studying for,

Answer 5

sure

Answer 6

Okay. After carrying out the following operations, how many significant figures are appropriate to show in the result? \[13.7+0.027\div8.221\]

Answer 7

there should only be one sig fig after the decimal place due to 13.7 in the equation.

Answer 8

Okay. so do you have to work the problem out or if I just notice which has the least sig fig thats the answer?

Answer 9

If they ask you to work out you probably should... but you could find the sig figs pretty much right off the bat just by looking for the number that's part of the equation with the least amount of sig figs

Answer 10

okay. Sorry to keep bothering you but I have a few more is that okay?

Answer 11

yup

Answer 12

Okay. it is a conversion question, which I am completely confused on how to do without looking it up on google lol. It satys what is 22.6 m when converted to decimeters?

Answer 13

Ok conversions are hard for me too... but the simple ones I can do. Just try to remember the basics for this one... 1 meter is 10 decimetres, 1 meter is 100 centimeters, and 1 meter is 1000mm. So all you do is multiply 10decimetres with 22.6m and theres your answer.

Answer 14

Okay, next one is what is 25.4 mg when converted to kilograms

Answer 15

This going to sound very confusing... 1 kg = 1000g, therefore 1kg=1000000mg... divide 25.4mg by 1000000mg to get kg.

Answer 16

so it would be 0.0000254 or 2.54 x 10^-5 in scientific notation correct?

Answer 17

yes

Answer 18

Okay. Thank you for the help. hope your not annoyed with all the questions? The next one is What is 3.0 x 10^10 cm/s when converted to ft/s

Answer 19

there is 30.5 cm in a ft, again something we have to remember.... just divide it by 30.5 cm... don't even think about the 's' , they're the same units...
sorry for long response went to take number 2...

Answer 20

Okay. give me a second, just trying to write everything down, calculate and make sure I understand

Answer 21

So I got 983606.5574 and my answer choices are:
A. 3.3 x 10^8 B. 2.4 x 10^9 C. 9.8 x 10^8 and D. 30x10^8
So would it be C?

Answer 22

you must have calculated it wrong I plugged it in and I got (c)..

Answer 23

I did 30,000,000 (3.0 X 10^10) divided by 30.5 right?

Answer 24

nevermind i found the mistake

Answer 25

im still getting 983606557.4????

Answer 26

yeah that's the right answer. don't count the 9 as part of the 8 in 10^8.

Answer 27

oh. Okay. I see it now.

Answer 28

next one I tried on my own but have no idea what the equivalent would be its. convert 28.3 ug to pounds and ill draw what the ug looks like.

Answer 29

i guess the prefix for this is micro?

Answer 30

this stuff is getting hard... alright in a microgram there is 1 x 10^-6 grams and in a pound there is about 453 grams... so start with 28.3 x 10^-6 to get grams then divide that by 453 to get pounds

Answer 31

do you they give you a table or something? there is a ton of conversions you could ask me that you have to memorize... and even I don't have all of them memorized...

Answer 32

They do but not with micrograms and stuff like that. it only gives me km, m, cm, L, dL, mL, kg, g, hours, and minutes.

Answer 33

so they can pretty much ask you anything... and if you didn't memorize it your gonna take it up the retrice.. good luck I say to thee.......

Answer 34

Yeah. that's why im stressing about this test. Its the first of the semester and if I don't pass this i fail the semester... hate college!

Answer 35

I guess I need to research online some of these conversions and write them on the only paper we can use.

Answer 36

so you can write conversions of a "cheat sheet" right?

Answer 37

yeah, they give us half of them but not everything we need to know for the test obviously.

anyway, do you have time for a few more?

Answer 38

im taking second semester uni. and my cheat sheet looks like this

tera 10^12
giga 10^9
mega 10^5
kilo 10^3
hector 10^2
deka 10^1
deci 10^-1
centi 10^-2
milli 10^-3
micro 10^-6
nano 10^-9
pico 10^-12
femto 10^-15

and
angstrome 10^-10

Answer 39

They gave me that but I didnt know what it was for lol. so i guess it implies 1 x whatever the 10^exponent is?

Answer 40

here i'll give you an example convert 236 pm to cm.
\[cm=236x10^-12picom/ 1 x10^-2centim = 2.36x10^-8\]

Answer 41

Yeah, I would love to have whatever "cheats" you have like 30.5 cm = 1ft (never knew that) if you have anymore like that can you email them to me?

Answer 42

are you doing gas conversions too?

Answer 43

i'm not sure yet, were only 2 weeks into the semester.

Answer 44

...do you skip class......

Answer 45

I used to, I cant anymore this semester is my last chance or I do not get financial aid.

Answer 46

are you taking college in the states or elsewhere?

Answer 47

States. I go to a community college close to my hometown.

Answer 48

Ok that's why you guys use inches and pellet like that... we use imperial and you guys use metric...

Answer 49

Were using Metric and SI.