1. A certain element decays at a rate of 000163/year. Of a piece of this element

1. A certain element decays at a rate of 000163/year. Of a piece of this element of 450 kg, how much will remain in ten years?
2. Two variables are related by the equation 2 inx+ Iny-y. What is the equation of the tangent line to the graph of this relation at the point (1.1)?3.i invest $100,000 in a company for five years, with a guaranteed income of 8% per year, compounded semi-annually. How much will I have at the end of 5 years? If the interest were compounded continuously, how much would I have in 5 years?