Questions regarding calculators such as the TI-83 (Plus), HP 50g, and other calculator models.

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2
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0answers
44 views

Math for Future Value of Growing Annuity

Am I working this out correctly? I need to verify that my code is correct... $$1000 \cdot \left(\frac{(1 + 0.1 / 12)^{40 * 12} - (1 + 0.06 / 12)^{40 * 12}}{(0.1 / 12) - (0.06 / 12)}\right)$$ ...
1
vote
3answers
22 views

Percentage operation gives different results with two scientific calculator

The operation is: $21.99 + 9.75$$\%$ On the Texas Instruments model TI36X-Pro the answer is: $22.0875$ But when I tried on the Casio FX-991ES Plus the result is: $24.134025$ Which is the correct ...
1
vote
2answers
43 views

Weird computation error when using fnInt (numerical integral) on TI-84 Plus

Today in Calculus class I was bored so I decided to try and approximate $\pi$ by evaluating $ \left( \displaystyle \int_{-a}^a e^{-x^2} dx \right)^2$ on my calculator for larger and larger values of ...
0
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0answers
23 views

Using a casio calculator for numerical methods

I am just starting numerical methods, and I find myself typing in an equation into my calculator to get an answer, then re-inputting the answer to that iteration back into the equation, repeat etc. I ...
0
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0answers
15 views

How to find a model of the form $v = at^3 + bt^2 + ct + d$ with TI NSpire?

A homework problem in my book states: An experimental vehicle is tested on a straight track. It starts from rest, and its velocity v (in meters per second) is recorded every 10 seconds for 1 minute. ...
0
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2answers
19 views

Drawing straight line graph with large scale

I was given the equation: $$y(x) = 10000x + 150000 ,~~ 0 \lt x \lt 60$$ and was asked to draw the graph. I know that it is a positive straight line intercepting through $150000$, but I don't know ...
12
votes
9answers
4k views

How to calculate $e^x$ with a standard calculator

Is there a simple method for calculating the $e^x$ ($x\in\mathbb{R}$) with a basic add/subtract/multiply/divide calculator that converges in reasonable time, preferably without having to memorize ...
4
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5answers
69 views

Calculate ln(x) using 8-digit calculator

I have a bit of a unique problem. Well, maybe not a problem because I'm really just curious about it, but... I have a simple 8 digit calculator. It has +, -, x, /, and a constant operation function. ...
0
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2answers
44 views

Calculator similar to Desmos but for 3D

Is there a calculator with functionality similar to Desmos but in 3 dimensions? I am looking to learn about families of quadric surfaces so I am looking for a 3D calculator with sliders.
2
votes
2answers
56 views

Simplfy a complex matrix into a real one

I encounter systems of linear complex equations (At most 3 equations) in my circuit analysis course. The calculator I am using is Casio fx-991ES and it only accepts real elements when in matrix or ...
0
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1answer
62 views

Graphing an ellipse on TI-nspire CX CAS

How do I graph an ellipse on a TI-nspire CX CAS? I know how to graph an ellipse with the equation $$\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2 }=1$$ but I don't know how to put coefficients in the ...
4
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6answers
628 views

How can I find the value of $\ln( |x|)$ without using the calculator?

I want to know if there is a way to find for example $\ln(2)$, without using the calculator ? Thanks
3
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7answers
761 views

Why do I disagree with my calculator?

I followed the order of opperations but my answer disagrees with my calulator's. Problem: $331.91 - 1.03 - 19.90 + 150.00$ Calculator answer: $460.98$ My answer: $162.98$ Why the ...
0
votes
1answer
35 views

how can get simple function

how can get $y$ simple function of $x$ from : $$ \frac{2 \sqrt{y} \sqrt{y-b} \log \left(\sqrt{y-b}+\sqrt{y}\right)}{\sqrt{\frac{A y (y-b)}{b}}}+\text{constant} =x$$ where : $$ y=y_0 at x=0$$ and ...
3
votes
1answer
90 views

What exactly do the sin, cos, tan buttons do on a calculator?

I understand they mean sine, cosine, tangent, but what exactly is the calculator doing when I enter an angle and press those buttons? Edit: To help others better understand my question, my question ...
0
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3answers
117 views

Need a good non-graphing calculus calculator that can derive and integrate

It's my 3rd time going through Calculus II and I want to pass this class already. I'm not trying to cheat I just see people with fancy calculators and I have never even used a calculator on tests ...
0
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0answers
39 views

Calculator for math/finance/statistics that can store .PDF

I need a new calculator. And rather than googling and doing research, I figured somebody on stackexchange probably know this. Requirements/facts about me Symbolic calculator (can do double ...
1
vote
1answer
95 views

Weird stuff happening with complex numbers on a ti-84

So, I'm trying to do some calculations for my Electrical engineering homework. This requires a bit of algebra with complex numbers. I have been finding that some of the calculations that my calculator ...
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votes
1answer
84 views

help - how to calculate distance between to points ( latitude/longtitude) without ACOS / ATAN

I need to calculate the distance between to points (latitude/longitude) in WebI (SAP system) and I have limited formulas there (don't have : ACOS / ...
16
votes
3answers
591 views

Why would a calculator have base 5?

I have a calculator that I found recently that has a base 5 option. It has options labelled HEX, BIN, DEC, OCT, and PEN. My son set it on PEN, and no numbers above 4 worked anymore. Playing around ...
0
votes
3answers
39 views

Order of powers

Which of the following is $a^{b^c}$ equal to? $a^{(b^c)}$ or ${(a^b)}^c = a^{bc}$ This is probably a really basic question but I can't seem to find the answer anywhere.
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3answers
33 views

If 0.00 currencyx is 1380 then how much is 1.00 currencyx

If for USD 1380 you get 0.000198670 lets say Currency X then whats the price of 1.00000 Currency X and what formula should I apply
1
vote
1answer
40 views

From $\tan\varphi = -3/2 = -1,5$ to $\varphi\approx 123,69^\circ$

Sorry for this question but what do I have to type into my counter to come from $$\tan \varphi = -1,5 $$ to $\approx 123,69^\circ$ and $\approx 303,69^\circ$? Thanks!
1
vote
2answers
72 views

TI83+. Math-> Solver. Why does it give different solutions?

Not sure if anyone still uses this one.... Recall the keystrokes: Math 0:Solver Up arrow Enter equation Press ENTER You will now be at a prompt displaying the equation, and a line saying x=### ...
5
votes
3answers
574 views

Base-2 exponentiation bug on Citizen SR-270X for $2^{255}$?

According to my calculator, $2^{255} = 0.5$. Also, for the range $2^x, x\in[254.5, 255.5)$ the result spans $[0.3535533906, 0.7071067812]$. Outside of that, the answers seem correct. Curiosly, ...
0
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1answer
45 views

Rational calculator

I am calculating a recursive equation: $X_n = \frac{1}{2}(X_{n-1} + \frac{3}{X_{n-1}})$ I need a free online calculator that can calculate for $n=7$ $(1/2)\times(88063572/50843527+(3\times ...
0
votes
1answer
160 views

Graphing multivariable functions

Is it possible to graph out a multivariable function (3 variables at max) on a graphing calculator? If yes, how? My instrument is the TI83.
22
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4answers
6k views

Calculator algorithms

Does there exist a good reference on the algorithms used by calculators, especially on the trigonometric and transcendental functions? I would still like to know how Casio generates its random ...
0
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1answer
630 views

Exact answers on a Ti84/Ti-nspire CX [closed]

I have three calculator: - very basic ti-30xb Multiview - ti84plus - Ti-nspire cx When I'm calculation something like $sin(60)*6$ my 10 euro Ti-30xb will give me the exact answer $3\sqrt3$. However ...
0
votes
1answer
98 views

Online calculator for sha256(“foo”) mod 100 [closed]

How can most people easily solve stuff like this: sha256("foo") mod 100 google and wolframalpha didn't do it. By easily I mean like type it in an online web calculator, or use software installed by ...
0
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1answer
99 views

What is the CPLX button on a calculator?

On my cheap "dollar store" scientific calculator, it has a 2nd function button named "CPLX". When you press it, the calculator displays some text similar to the "DEG, RAD, GRAD" that says "CPLX". ...
1
vote
1answer
46 views

Graph of $(e^x-1)/x$ as x->0

This question may be as much computer science as math, as I don't believe the reason is mathematical; however an odd thing a classmate of mine pointed out: if you look at a graph of the function in ...
2
votes
3answers
5k views

Calculate remainder on Casio fx-991 ES Calculator

Is it possible or not to calculate remainder through use of Casio fx-991 ES Calculator. If possible then how for example :- I have to calculate remainder of ...
19
votes
7answers
1k views

“Why do I always get 1 when I keep hitting the square root button on my calculator?”

I asked myself this question when I was a young boy playing around with the calculator. Today, I think I know the answer, but I'm not sure whether I'd be able to explain it to a child or layman ...
1
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1answer
1k views

Checking for symmetry in a graph on the TI-84 Plus

I was using the TI-84 Plus calculator to check for Y-Axis symmetry in the graph of "cos(2X+1)" and as I had to do it fast (I was in the middle of a test), I quickly noted that it was symmetrical. I ...
2
votes
2answers
163 views

In my calculator why does $\sqrt4 -2=-8.1648465955514287168521180122928e-39?$

I have tried this on my Windows 7 calculator with $\sqrt9 -3 $ it too gives some weird answer- ie$1.1546388020691628168216106791278e-37$. And so for any $n$(positive) $\sqrt n^2-n= wierd_ .answer$ Why ...
24
votes
6answers
2k views

Why does my calculator show $2^{-329} = 0?$

On my calculator, I usually get a $0$ when I divide something by $2$, a lot of times if that makes sense, but I was just wondering why does $2^{-329} = 0?$
-2
votes
3answers
514 views

Find the limit $\lim_{x\to 0}\frac{1-\cos 2x}{1-\cos x}$ without using L'Hospital [closed]

Help me calculate this limit: $$\lim_{x\to 0}\frac{1-\cos 2x}{1-\cos x}$$
0
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1answer
11 views

Calcution's functionality & webapplication

Is there a application in Internet or a function in a calculator at windows 7 to make a caculation containing 400 and 360? It is easier to calculate if numbers have low numbers.
2
votes
0answers
138 views

Solving $x$ for $y = x^x$ using a normal scientific calculator (no native Lambert W function)?

Solving $x$ for $y = x^x$ using Lambert W function is clear enough thanks to this handy answer, but as I'm using the solution in a network support document I need it in a form that can be solved on a ...
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0answers
439 views

Multivariable polynomial long division calculator

Is there code/online calculator that divides polynomials in multiple variables? The answers are always other polynomials, but they have many variables.
3
votes
4answers
9k views

TI-83 Plus: Is it possible to find the eigenvalues on this calculator?

I searched the Internet and can't seem to find a source on how to find the eigenvalues on a TI-83 Plus calculator. Can anyone give me a hand?
3
votes
5answers
577 views

What type of input does trigonometric functions take in

I see in my Book that 45 deg is equivalent of π/4 . Ι also do the conversion if I simply convert degrees into radians like this 45* π/180 = π/4 radians and ...
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votes
1answer
515 views

how do you define the decimals indicator: E-3?

Sorry for the terrible question, but how do you define E-3, which is used in the calculators to indicate that the first 3 decimals in the number are not displayed ? ...
0
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1answer
1k views

Enter “Int” on Casio graphical calculator

Hi I know this sounds like a really beginner question, but I cannot find how to enter the terms "Int" and "Ran#" into my calculator (Casio fx-9750GII) My code is thus: 1->L 100->H Int ...
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1answer
186 views

Calculator for real and complex parts of a polynomial.

Does anyone know of a nice calculator for calculating the real and complex parts of a complex polynomial. Say, for example, I want to write the polynomial $p(z)=z^3+2z^2+1$ as a function ...
0
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2answers
356 views

Plot 1, …, Plot 3 switches on TI-83 calculator

My student has a TI-83 (I think - it is black, and newer than mine, and I have a TI-82), and she asked me what the three switches were, those at the top of the function list screen (where you input ...
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4answers
1k views

When the denominator is larger than the numerator, why does the modulo equal the numerator?

As an example, why does 1 modulo 2 equal 1? According to Google's built-in calculator: 1 % 2 = 1 5 % 40 = 5 12 % 2000 = 12 Why is the remainder not "0", ...
1
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1answer
172 views

How to calculate Mortgage calculation

I have this formula for Mortgage calculation and now i want loan amount value using with same formula. ...
0
votes
2answers
475 views

Need to calculate my final marks - help

I don't know the formula to calculate my marks for a subject. The first tests accounts for 38% of the overall grade whereas the final exam accounts for 62%. Let us say that on the first test I got a ...