I need help solving it and rounding

He expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. if the length is fraction 2 over 3 unit and the width is fraction 1 over 3 unit, what is the perimeter of the rectangle in units? fraction 2 over 3 unit 1 unit 1fraction 2 over 3 units 2 units

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2