find a equivalent expression for each number,using the denominator indicated .use multiplication by 1

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mwilson23

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find a equivalent expression for each number,using the denominator indicated .use multiplication by 1

8.) 5/3= ?/-18

16.) -10/21 =?/126

simplify.

34.) 30/40

44.) 117/91

54.) -19x/38xy

Posted 189 day ago

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Answers (4)

atta

8) 5/3 = ?/-18 = (-30/-18) = 30/18 = 10 / 6 = (-6/-18) * 5 = 5/3
9) -10/21 = ?/126 = (-60/126) = (-6/126) * 10 = -10/21

34) 30/40 = (3/4)(10/10) = (3/4)(1) = 3/4 = 0.75
44) 117/91 = 9/7 = 1.285714285714285714285714285714....
54) -19x/38xy = (-19x/38x)(1/y) = (-1/2y).

J.C

Posted 186 day ago

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marycurry

When they say "multiplication by 1" they mean to multiply denominator and numerator by the same number. #8 - multiply both by -6; #16 - multiply both by 6.

Simplifying is merely finding a common factor and dividing both by it. #34 it would be ten; #44 it would be 13; #54 it would be 19x.

Posted 188 day ago

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math_fanatic

I don't understand what you mean by "use multiplication by 1" but here are the solutions:

8) Cross multiply. let "?" = x
-18(5) = 3x
divide both sides by 3: -6(5) = x so x = -30

16) Cross multiply.
-10(126) = 21x
divide both sides by 21: x = 60

34) 30/40 = 3/4
44) 117/91 = 9/7 (117 and 91 are both divisible by 13)
54) the x's cancel so you are left with -19/(38y)
19 and 38 are both divisible by 19 so the answer is -1/(2y)

Posted 188 day ago

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Doctor Bob

5/3 = ?/-18
to get -18, they multiplied by -6
and so, we multiply the 5 by -6 and get -30
---------------------------------------------------------

-10/21 = ?/126
to get 126, they multiplied the 21 by 6
and so, we multiply -10 by 6 and get -60
-----------------------------------------------------

I don't understand #34,44,54 as written

Posted 189 day ago

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