Explain how can you calculate a waves speed, wavelength, or frequency, if you know two of the three quantities

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

Answerthe distance between the two ends of the galaxy is 150,000 light years;