An environmentalist wants to measure the width of the river to monitor its erosion. From point A
she walks downstream 100 feet and measures
the angle from this point to point C to be 60°.
How wide is the river?

its line 2 i just added the rest or else it wouldn't let me answer

a and c

for infinitely many solutions we require both left and right sides to be equal

distribute and simplify

a

14 - 8x = 20 - 8x - 6 = 14 - 8x ← both sides equal so infinite solutions

b

6x - 54 = 6x - 54 + x = 7x - 54 ← not equal

c

4x + 16 = 4x + 10 + 6 = 4x + 16 ← both sides equal so infinite solutions

d

5x - 40 + 10 = 5x + 10

5x - 30 = 5x + 10 ← not equal

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15

hope this