Express 0.00212 in scientific notation.

Nick and nora are married and have three children in college. they have an adjusted gross income of 47,400. if their standard deduction is 12,600 itemized deductions are 14,200 and they get an exemption of 4000 for each adult and each dependent what is their taxable income

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

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