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What is 5+3?

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.