2 answers:
It is an isosceles triangle and therefore
3x = x + 10
2x = 10
x = 5
Since x = 5 and MN = x + 10 then,
MN = 15.
Because this is an isosceles triangle, 3x = x + 10. Thus, 2x + 10 and x = 5.
With x=5, MN has the length 5+10, or 15.
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Answer:
4.26363636364 or this fraction 4 and 6590909090/25000000000
Step-by-step explanation:
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And 
can also be written as

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For # 9, the answer is 4 pants and 11 shirts, see in the comments for my explanation
Can uu show the rest of the graph??????
Yes 1 and 3 are supplementary