$.$ What is the future value $($FV$)$ in $8$ years of $$3,500$ invested at a $6\%$ interest rate, paid and compounded monthly?

What is the present value $($PVA$)$ of an annulity paying $$1,750$ at the end of every year for $10$ years, discounted at a $4\%$ interest rate?

FN $5\mathrm{.}5$ s trade at a price of $98\mathrm{.}375$ and FN $6$ s at $100\mathrm{.}625,$ what is current coupon $($hypothetical coupon of par$-$priced MBS$)?$