Question

Honestly I don't know what to do at this point

You are trying to find the distance d across the river, but your map is incomplete. ABC is similar to EDC
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Answer 1

175 ft

Explanation:

So because these triangles are similar, you can use ratios to find the distances. For the smaller triangle, 100/700 is a 1 to 7 ratio. From that, because it's the longer side, you can divide 1225 by 7 to find d, which is 175 ft.

Answer 2

175 ft

Explanation:

So because these triangles are similar, you can use ratios to find the distances. For the smaller triangle, 100/700 is a 1 to 7 ratio. From that, because it's the longer side, you can divide 1225 by 7 to find d, which is 175 ft.