221 reputation
11
bio website
location New York
age
visits member for 2 years, 2 months
seen Sep 18 at 0:39

I am a retired Electrical Engineer with 42 years of experience. I have BSEE and MSEE degrees.


Aug
13
awarded  Yearling
Aug
12
answered What is power of number like (power of 2, power of 10)? and how to calculate power of number.
Jun
20
comment Given $d(x) = \sqrt x + 3$ and $g(x) = 3\sqrt x - 2$, find $k(x) = 4\left(\frac{g}{d}\right)(x)$.
The questioner's answer is not correct since he has a 14 instead of 24.
Jun
20
answered Given: $f(x)=5/(x+4)$ and $g(x)= -1/(7-x),$ find $h(x)=(fg)(-3)?$
Jun
20
answered What does it mean “Range”?
Jun
17
comment Two students clean 5 rooms in 4 hours. How long do 40 students need for 40 rooms?
You flipped the numbers: they both clean 5/4 rooms per hour and one then cleans 5/8 rooms per hour. Forty students can thus clean 200/8 rooms per hour or 25 rooms per hour. To clean 40 rooms then takes 40/25 or 1.6 hours, in agreement with all of the above answers.
Dec
1
answered What's wrong with my sum? ($S=1^2+2^2+3^2+\cdots+10000$)
Nov
29
comment What's wrong with my Mac Grapher?
I used by trusty TI-83 calculator and it graphed all of the functions over the whole domain with no problems.
Oct
29
comment Which filter is the most suitable if I know points with zero noise amplitude
I think some more information is needed. First, you seem to have n points consisting of data plus additive noise. Somehow you know that the additive noise is zero for some of the points. However you are using the same index n for both of these series. I think you need to redefine the index of the points with zero noise, e.g. m where, presumably m<n. As for a filter, a better description of the input and expected output of this filter is needed.
Oct
28
comment Very very simple probability question
Your solution is correct but this is not a probability question as it is completely deterministic. No probability is involved.
Oct
9
answered How do I find the solution for these exponential equations?
Sep
27
answered Find the solution of each of the following initial value problems
Sep
25
comment Why is $i! = 0.498015668 - 0.154949828i$?
the "z" should be a "t" in the last formula.
Sep
3
awarded  Teacher
Jun
28
comment Section of a circle
In your example, the height to the chord is equal to the radius. Therefore the chord becomes a diameter and the angle subtended by a diameter is 180 degrees.
Jun
28
answered Section of a circle