Pls help this is math: scientific notation

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A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)