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Mathematics 15 Online
OpenStudy (anonymous):

1

OpenStudy (turingtest):

\[{9x^4\over4y^3}\cdot{3x^2\over8y^5}\]?

OpenStudy (anonymous):

yes, sorry didn't know how to put it in equation form!

OpenStudy (turingtest):

multiply straight across, and remember that\[x^a\cdot x^b=x^{a+b}\]

OpenStudy (anonymous):

27x^6/32y^8 is what I got originally but that's not an option for one of the answers.

OpenStudy (turingtest):

well then something is wrong

OpenStudy (anonymous):

The options are 6x^2y^2, x^2y^2/6, 6/x^2y^2, and 1/6x^2y^2? O:

OpenStudy (turingtest):

is the problem maybe\[{9x^4\over4y^3}\cdot{8y^5\over3x^2}\]?

OpenStudy (anonymous):

Oh, wait. Dang it, the multiplication sign should have been a division sign, whoops.

OpenStudy (turingtest):

the rule is\[{a\over b}\div{c\over d}={a\over b}\cdot{d\over c}\]so in this case we have\[{9x^4\over4y^3}\div{3x^2\over8y^5}={9x^4\over4y^3}\cdot{8y^5\over3x^2}\]

OpenStudy (turingtest):

now can you solve it?

OpenStudy (anonymous):

Oh, so it's flipped? Yeah, I can solve it now. Thanks. (:

OpenStudy (turingtest):

more properly stated: "dividing by a fraction is the same as multiplying by its reciprocal" -yep, that's the rule you're welcome :D

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