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 Mar22 revised Can't Get Present Value Answer? added 21 characters in body Mar22 answered Can't Get Present Value Answer? Mar22 comment Can't Get Present Value Answer? My only other pieces of advice are to make sure you are using the correct interest rate, and double checking your formula. 8% compounded quarterly is 2% effective quarterly, and I've never seen present value described as you have laid it out (see e.g. wikipedia) Mar22 comment Can't Get Present Value Answer? Well then, it certainly seems as if the issue is that you are using the formula as directed instead of understanding how and why such a formula exists. I suggest writing down a cash flow diagram, the associated present value of the payments, and realizing you're summing a geometric series. Mar22 comment Can't Get Present Value Answer? Can you tell us what you did 1 or 2 of those 20 times? If you understand how an annuity is calculated, the solution is immediate, this isn't a tricky problem. Mar22 revised Can't Get Present Value Answer? corrected tags Mar1 comment Properties of a transpose I'd use induction, and the property $(AB)^T = B^T A^T$ Mar1 comment Properties of a transpose You don't know A is invertible, so how will the property you listed help you? Feb28 comment why and when t0 use norm instead of abs and vice versa the absolute value has a specific definition. the norm can have multiple definitions, depending on context. the absolute value is a norm, but a norm is not necessarily an absolute value. You might even see people "abuse notation" and use the absolute value bars in place of norm bars. Feb28 comment Significance of orthonormal basis in wavelet analysis mathoverflow.net/questions/42040/… Feb22 comment YTM and YTC. how do you discount the coupon rate? you discount using the yield rate Feb20 comment Bad notation in Fulton's algebraic curves book Seems to me like this is defined on Page 3 (it's the derivative). It's also listed in the "Notation"/Table of Symbols on page 117. Feb12 comment House loses value each year. How long will it take for the house to be worth $150000 that looks right to me... can you solve it from there? Feb12 comment House loses value each year. How long will it take for the house to be worth$150000 Have you tried setting up an equation to solve? Do you know about logarithms? Feb12 revised House loses value each year. How long will it take for the house to be worth $150000 added 10 characters in body; edited tags Feb8 revised If a and b are in G and ab=ba, then we say a and b commute. Assuming a and b commute, prove: added assumptions to body Feb8 comment If a and b are in G and ab=ba, then we say a and b commute. Assuming a and b commute, prove: your steps aren't right, you can't go from$xabx^{-1}$to$xax^{-1}b$(you do moves like this a couple times). all you know is that$a$and$b$commute, you know nothing about whether$x$commutes with$a$or$b$. additionally, you claim this is by the associative property, which it is not (it's commutative). Feb8 comment What integration rule to use? Use partial fraction decomposition. Feb8 comment How to show that this Cayley Table does not form a group The Klein-4 group is not in Z4. There are two groups of order 4 (up to isomorphism), one is Z4, one is the Klein-4 group. Feb8 comment$f$is continuous on$[a,b]$, differentiable on$(a,b)$, why does that imply that$g(x)=\frac {f(x)} x$? what is the context of the problem? you can define g because$x \neq 0\$ on your interval so the quotient is well-defined.