Answer:
Cross Multiplying.
Step-by-step explanation:
By multiplying each ratio by the second number of the other ratio, you can determine if they are equivalent. Multiply both numbers in the first ratio by the second number of the second ratio. For example, if the ratios are 3:5 and 9:15, multiply 3 by 15 and 5 by 15 to get 45:75.
<h3>
Answer: A) 5.39</h3>
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Explanation:
Apply the distance formula.

You could also use the pythagorean theorem which is what the distance formula is based off of.
Answer:
x=4 and the solution is not extraneous
Step-by-step explanation:

This solution is not extraneous, because plugging it back in you get:

Hope this helps!