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Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

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

The ideal weight of a nickel is 0.176 ounce. to check that there are 40 nickels in a roll, a bank weighs the roll and allows for an error of 0.015 ounce in total weight