- A Cepheid variable star has a period of 5 days, estimate its luminosity, in solar units.?

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What is the numerical ratio of the rate of change in the concentration of CO2 to the rate of change in the concentration of O2? Find the x of 2x+3y=13 with 2x+5y=7? Find the area of the surface generated by rotating the curve y = e^2x, 0 ≤ x ≤ 1, about the x-axis.? If an object moves 40 m north, 40 m west, 40 m south, and 40 m east, what's the total displacement? A. 80 m B. 0 m C. 160 m D. 40 m? Physics resistance question?