- Solve e^(x+3)=7^x?

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(8^-2z^-3y)^-1/((5y^2z^-3)^3(10y^0z^-2)^2? Find the arc length of the subtending arc for an angle of 35 degrees on a circle of radius 10.? How much water flows in to the ocean from all the rivers in the world? I want to be a cardiologist and an entrepreneur... how does a doctor work this? Precalculas question?