anonymous
  • anonymous
for this question do you divide?
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
A weather balloon holds 2,850 cubic meters of helium. The density of helium is 0.1685 kilograms per cubic meter. How many kilograms of helium does the balloon contain? Please round your answer to the nearest whole number. Only enter a numerical value in the answer blank.
anonymous
  • anonymous
you would divide 2850 / 0.1685?
jim_thompson5910
  • jim_thompson5910
If you knew the mass and volume, you divide to get the density. However, we don't know the mass which is why we end up multiplying instead (think of it as undoing division) Density = mass/volume D = m/v 0.1685 = m/2850 0.1685*2850 = m ... Multiply both sides by 2850 to isolate m m = ??.

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
i got 480.225
anonymous
  • anonymous
is that correct?
anonymous
  • anonymous
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
I'm getting the same. Then you round to the nearest whole number.
anonymous
  • anonymous
so 480
anonymous
  • anonymous
can you check one more question?
jim_thompson5910
  • jim_thompson5910
sure
anonymous
  • anonymous
The population of Tinyville is 16.2 Tinys per acre. Exactly 405 Tinys live in Tinyville. How many acres is Tinyville? Only enter a numerical value in the answer blank.
anonymous
  • anonymous
i got 0.04
anonymous
  • anonymous
should i have multiplied?
jim_thompson5910
  • jim_thompson5910
population density = (# of people total)/(total area)
jim_thompson5910
  • jim_thompson5910
population density = 16.2 Tinys per acre # of people total = 405 tinys area = unknown
jim_thompson5910
  • jim_thompson5910
let x = unknown area population density = (# of people total)/(total area) 16.2 = 405/x x = ??
anonymous
  • anonymous
i got 25 0.0
jim_thompson5910
  • jim_thompson5910
25 acres is correct
jim_thompson5910
  • jim_thompson5910
hopefully that's a face after the 25? and it's not two hundred fifty point zero?
anonymous
  • anonymous
yeah its a face lol
jim_thompson5910
  • jim_thompson5910
I thought so but wasn't sure lol
phi
  • phi
one way to keep things straight about multiplying or dividing is to use ratios when you see "16.2 Tinys per acre" read 16.2 Tinys per 1 acre" and the word "per" read as "divided by" that is, write the ratio \[ \frac{ 16.2 \ Tiny }{1 \ acre} \] Next they say: Exactly 405 Tinys ... x (unknown acres) write another ratio of # of Tiny's divided by number of acres \[ \frac{ 16.2 \ Tiny }{1 \ acre} = \frac{405}{x} \] now you "solve for x"
phi
  • phi
the first trick, is if the x is in the bottom, you can "flip" both sides \[ \frac{1 \ acre} { 16.2 \ Tiny }= \frac{x}{405 \ Tinys} \] now to "solve for x" multiply both sides by 450 Tinys \[ \frac{1 \ acre} { 16.2 \ Tiny } \cdot 450 \ Tinys= \frac{x}{405 \ Tinys} \cdot 450 \ Tinys\] and that simplifies to \[\frac{ 450}{16.2} \ acres= x \]

Looking for something else?

Not the answer you are looking for? Search for more explanations.