Answer:
390cm
Step-by-step explanation:
We got a three 18 of 80 times,
rel freq = 18/80 = 22.5%
You need to isolate x.
71 - 5x = 9x - 13
Add 13 to both sides.
84 - 5x = 9x
Add 5x to both sides.
84 = 14x
Divide both sides by 14.
6 = x
<h3>The answer is x = 6.</h3>
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