Answer:
the third angle= 180-x-(4x+15)
Step-by-step explanation:
if we subtract the two other angles the result will be the measure of the last one
the balloon starts at a height of 0 ft and rises at a rate of 100 ft.
y = 3x - 7
Starting with 3x - y = 7
-y = -3x + 7
OR
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