The answer should be 'b ≤ 7' because b should equal or be less than 7 bags.
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1) We know that <DAB and <BAC are supplementary angles according to the exterior angle theorem, so we set up the following equation and solve:
105+x=180
x=75
2) Since we have the angles for <BAC and <ABC and a triangle has its total angles added up to 180, we can set up an equation to find <ABC and solve:
75+35+x=180
110+x=180
x=70
So the m<ABC is 70 degrees.
Hope this helped! Let me know if you need me to clarify anything.
A right angle is 90 degrees so if you want 2/4 or 1/2 of it you would multiply 90 by .5(or 1/2 if you like fractions) the answer is 45 degrees.
