136mm?? Isn't it 68 x 2 because Y-K and V-Y are the same, so 68 x 2=136? I don't know
Answer:
40 points
Step-by-step explanation:
The score for the first four rounds of the game is 13, 17, 19, and 21 points.
Let
and
be the scores of the fifth and sixth games respectively in order to achieve an average score of 20 points per round for all six rounds.




Hence, the combined score of the fifth and sixth rounds are 40 points.
I'll give you a hint. <u><em>This questions is about order of operations for pemdas. Its stand for: p-parenthesis, e-exponents, m-multiply, d-divide, a-add and s-subtract that came from left to right.</em></u>
First you had to calculate with exponents first.


Then you multiply and divide from left to right.





Final answer: 
Hope this helps!
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-Charlie
Because the number is positive