3u + 21 divide 3 by both sides and your answer would be u= 7 :)
About 25 animals were going towards the river
The distance from point Y to the y-axis is 4 units and the distance from point Z to the y-axis is 3 units, then the lelgth of the segment YZ is 4+3=7 units.
If <span>a scale factor is 3, then the length of Y'Z' will be 7·3=21 units.
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P.S. In the added picture you can see trapezoid ABCD that was dilated by a scale factor 3 about the origin. This may help to understand that all linear values after dilation become multiplied by scale factor.
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To eliminate the fraction, we multiply by 4
<h3>How to eliminate the fractions?</h3>
The equation is given as:
-3/4m-1/2=2+1/4m
Rewrite properly as:

The denominators of the above fractions are 2 and 4
The LCM of 2 and 4 is 4
So, we multiply through by 4.
This gives
-3m - 2 = 8 + m
Hence, to eliminate the fraction, we multiply by 4
Read more about fractions at:
brainly.com/question/10354322
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36 to 60 = 22
12 to 20 = 8
6 to 10 = 4
15 to 25 = 10
Hope you get the pattern, if not comment
Happy to Help!