Thanks tell the the answer he 78 I know this as 781 - is 780
Using the law of indices the equivalent expression of 
is 1728
<h3>How to find equivalent expression?</h3>
The equivalent expression of can be express as follows:
Using the law of indices,
Applying this laws,
Hence,
Finally,
12³ = 1728
learn more on expression here: brainly.com/question/16619965
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-42 decreased by 16 = -26
Constant of proportionality is 4
equation: x/y = 4
explanation:
let's take 20 and 5 for example, if you divide 20 by 5, you will 4 of course. that's the proportionality for the first one. if you continue to divide x value by y value you will get 4. for the last two you would divide 28 by 4 and multiply 8 by 4.
