Landon34
  • Landon34
Which of the following expressions represents the least common multiple of 15, 18, and 25? 2*3*5 2*3^2*5^2 2 · 3^3 · 5^3 2 · 3^2 · 5^3
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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whovianchick
  • whovianchick
Well I figured if you're asking a question you need help XD gimme a sec
welshfella
  • welshfella
15 = 3 * 5 18 = 2*3*3 25 = 5*5 where there are dupicates between the factors use the number once otherwise use all numbers
welshfella
  • welshfella
|dw:1449856382698:dw|

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More answers

Landon34
  • Landon34
oh, ok.
welshfella
  • welshfella
omit the circled numbers
welshfella
  • welshfella
its not so easy to explain A drawing is best.
Landon34
  • Landon34
what does omit mean?
welshfella
  • welshfella
leave out
Landon34
  • Landon34
ok.
whovianchick
  • whovianchick
First, solve the expressions. A= 30 B= 450 C=6750 D=2250 Next, find the least common multiple. Since we have our answer choices, let's use those. Is 30 a multiple of 15, 25, and 18? No. Just 15. Is 450 a multiple of 15, 18, and 25? Yes, it is! Let's check the others, though. Is 6750 a multiple of 15, 18, and 25? Yes, it is! Let's check the last one, though. Is 2250 a multiple of 15, 18, and 25? Yes, it is! We've got 3 answer choices that are multiples of all 3 numbers. However, we're looking for the LEAST common multiple, as in the smallest number. That would be 450. Break 450 down again to 2*3^2*5^2, and that's your answer! B: 2*3^2*5^2
Landon34
  • Landon34
so, we are going to leave 5 and 3 out.
welshfella
  • welshfella
yes
whovianchick
  • whovianchick
@Landon34 and @wishfella it's gonna be a lot easier to just solve for factors instead of doing that whole long process. It's easy to make mistakes doing that.
whovianchick
  • whovianchick
oops I meant @welshfella I typed your name wrong XD sorry
welshfella
  • welshfella
- because they pared up with 5 and 3 in one of the other factors
Landon34
  • Landon34
give each other medals. you deserve it.

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