Jan has 7 stickers. Her brother gives her 6 more stickers. Which doubles fact can you use to find how many stickers Jan has now?
2 answers:
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Answer:
Step-by-step explanation:
Suppose we have a triangle WXY whose internal angles are:
The sum of the measures of the angles must be 180°, thus:
Simplifying:
15x + 15 = 180
Subtracting 15:
15x = 165
Dividing by 15:
x = 11
Thus, the measure of angle Y is