Answer:
82 degrees
Step-by-step explanation:
It should all equal 180 so 52+46=98 and 180-98 is 82
By using exponent properties, we will get the simplified expression:

<h3>
How to simplify the given expression?</h3>
Here we have the expression:

Remember the exponent properties:

And:

So using these two properties, we can rewrite:

So we conclude that the completely simplified expression is:

If you want to learn more about exponents:
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Answer:
43.5
Step-by-step explanation:
x/2+5y-1.5
10/2+5×8-1.5
5+40-1.5
5+38.5
=43.5
2x -7=13 is an equation because it has an equal sign.