Which of the following best explains why cosine 2 pi/3 is not equal to cosine 5 pi/3

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)

If it 8 inch candle burns at 7/10 inch per hour and a 6 inch candle burns at 1/5 inch per hour after how many hours would both candles be the same height