Please I need help to solve these problems, formulas and procedures.

3. If P dollars are invested at the end of each year in an annuity that earns interest at an annual rate r, the amount in the account will be A dollars after n years, where Ar log P +1 n= log(1 + 7) If $1,200 is invested each year in an annuity that earns 11% annual interest, when will the account be worth $25,000? Round to the nearest tenth. 4 . A health insurance company wants to establish a prevention program for the community. Among the variables taken into account is the life expectancy of people in rural and urban areas, as presented in the following table: Urban zone Rural zone Year Men Women Men Women 1980 62.1 66.6 51.1 45.2 2000 67.4 74.1 61.1 67.4 2004 70.7 78.1 63.8 72.5 2006 74.9 80, 1 68.3 75.2 2008 75.1 80.3 68.8 75.6 2010 75.7 80.8 69.5 76.3 Construct a matrix W containing the life expectancy for the urban area and a matrix B for the life expectancy for the rural area. Apply matrix algebra concepts to find the difference between urban and rural areas. What can you conclude from this result