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Write the expression 7x^3-28xy^2 as the product of 3 factors

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.