The tutor shows a present value example on the Hewlett Packard 10B business calculator. Example: If $100 is received at month end for five years, at annual interest rate 3.2% compounded monthly, what is the total present value of the …
The tutor tells how to convert an angle from degrees to rads, or back, on various Sharps. On the Sharps I know, there is a button that has DRG above it. Pressing 2ndF, then that key, toggles the user between …
Math: trig: converting between degrees and rads on Sharp calculators Read more »
The tutor shows a nice trick to obtain a least squares line using matrix algebra. In my Nov 25 post I mentioned how, with Excel or LibreOffice Calc, to get a best-fit line for x y 0 3 2 5 …
Linear algebra: best fit line: method of least squares by hand Read more »
The tutor shows an example of how to price a bond. Example: Imagine the following scenario: a 20-yr $10K bond pays at 4% per year, compounded and paid semi-annually. However, realizing a present interest rate of only about 2.5%, a …
Math of finance: bond pricing, featuring the TI BA-35 Read more »
The tutor explains the difference between power and exponential curves. According to Excel, a power equation has the form y=axb whereas an exponential equation has the form y=aekx Example: I tried both options on the following data: x y 0.5 …
Spreadsheets: regression curves: power vs exponential Read more »
The tutor shows an example of a projection from one dimension into another. Let’s imagine we have the vector v 3 2 0 which we want to project in the direction of w 3 -1 0 The projection matrix, Pw, …
Linear algebra: projecting a vector along another one, matrix method. Read more »
The tutor tells the quick way to convert the accumulated balance after regular deposits between “beginning” vs “end of month” payments. In a previous post I tell how to find the end balance of an account after five years of …
The tutor shows how to find the balance of a savings account after monthly deposits over a period of years, using the Texas Instruments BA-35. Example: $100 is deposited into a savings account each month for five years. If the …
Financial calculators: TI BA-35: finding account balance after regular deposits Read more »
The tutor shows how to use the Texas Instruments BA-35 to find the interest rate of a loan. Example: Suppose a loan is made for $750. Twenty months later, it is repaid with a lump sum of $880. What is …
The tutor shows a technique for factoring expressions that contain brackets. The technique may be called compound factoring. Example: factor (2x-1)2 – 5(2x-1) – 24 Solution: Substitue A for (2x-1), then rewrite: A2 – 5A – 24 The expression is …
Math: Factoring expressions that already have brackets Read more »