You didn't write the (-2/7) as a power; you were supposed to do b to the power of -2 over 7, which is what the other person done in your other post regarding this
Answer:
The plant is responding to the stimulus of the sunlight.
I think I got it, but just in case...tell me the whole thing again. I wasn't listening.
Your possible triangles are:
20°, 80°, 50°