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Questions tagged [calculator]

Questions regarding calculators being used to solve math problems. A clear statement of the math problem to be solved is required.

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Simple question regarding fraction to ratio conversions

Supposed you have a ratio expressed in the form 4:8 . How do we convert this to fraction? One answer gives me 1/2 in its simplest form. Chatpt produces the same result [enter image description here][...
dazzleworth's user avatar
0 votes
2 answers
36 views

Logarithm approximation loses solution

I was doing an exercise in which I had to plot by hand a function. The function was $$f(x)=\ln\left(\frac{\sqrt[3]{x}}{3x - 1}\right)$$ which I rewrote into $$f(x)=\frac{\ln\left(x\right)}{3} - \ln\...
serax's user avatar
  • 135
-1 votes
1 answer
144 views

how to evaluate cosine value by non scientific calculator with at least 12 significant digits

everyone. I wanna know is there any method to evaluate cosine value by non-scientific calculator with at least 12 significant digits? Recently I have a mathematics exam and teachers can let us bring ...
calculatorholic's user avatar
0 votes
1 answer
34 views

How to stop a negative exponential from rounding to zero?

I'm doing materials homework and calculating vacancy density, which has some large constants (Na and k), and have to do the function. the right side of the density equation is exp(-Q/(kT)), which ...
Erwin Davinky's user avatar
1 vote
0 answers
58 views

Why does TI-84 show scientific notation for zeros sometimes but not others?

When graphing a function and then going through the process to calculate the zeroes (left bound, right bound, guess), is there a reason that sometimes it shows y = 0, but there are other times when it ...
mmmmmm's user avatar
  • 141
1 vote
1 answer
141 views

How do calculators represent floating points (somewhat) perfectly?

If you ask a programming language to calculate 0.6 + 0.7, you’ll get something like 1.2999998, and that’s because of how floating point numbers are represented in computers. But if you ask a ...
Samathan's user avatar
0 votes
1 answer
65 views

The sum of Cotes coefficients [closed]

Newton-Cotes coefficients is as follows $$ C_{i}^{(n)}=\frac{(-1)^{n-i}}{i !(n-i) ! n} \int_{0}^{n} \prod_{\substack{j=0 \\ j \neq i}}^{n}(t-j) d t $$ How can we prove that $$ \sum_{i=0}^nC_i^{(n)}=1 $...
Zye Wang's user avatar
1 vote
0 answers
71 views

Hiper Calc app: symbolic integration step functions possible?

The app (android) Hiper Calc is rather powerful, with great CAS-capabilities. But it doesn't seem to have step functions, or Piecewise, or other ways to define conditional functions. I tried to mimic ...
Stef Pillaert's user avatar
0 votes
0 answers
34 views

Seeking help with the application of Law of Large Numbers and Central Limit Theorem to calculate Investor Risk

I'm a newbie to the forum with zero financial or statistical skills - first time post...seeking some assistance and a solution..thanks in advance! I am trying to create a investor calculator or at ...
Darren's user avatar
  • 1
0 votes
2 answers
137 views

Zero to the power of negative numbers

I lately stumbled unto a strange behaviour of my calculator (a TI-Nspire™ CX II-T CAS): $$ \begin{split} 0^{-2} = 0^{-4} &= \infty & \forall \text{ even numbers}\\ 0^{-1}, 0^{-3} &=...
ttschnz's user avatar
  • 11
1 vote
2 answers
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Does there exist a projective CAS calculator?

I'm sorry if the question isn't strictly related to maths but I really can't seem to find anything good and I don't where to ask. Just to see some projective curves I thought to search for a Graphic ...
Orazio Cherubini's user avatar
2 votes
1 answer
155 views

Why did my calculator take this number for $e^x=0$, or better why does he even give a solution? [closed]

My calculator gives a solution to $e^x=0$, this on itself quite strange, but the value is also interesting: $x=-9,9997457056636 \times 10^{98}$. My best guess is that it has to do with the limit of $x$...
VCTR's user avatar
  • 41
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0 answers
170 views

Online calculator for linear algebra complete solution to a system of linear equations

Looking for an online calculator that can provide the complete solution to a system of linear equations $Ax= b$ (given matrix $A_{m\times n}$ and $b\in \mathbb R^m$) as a self-study resource for my ...
Steve's user avatar
  • 555
1 vote
2 answers
74 views

Conversion of fractional decimals to binary using a calculator. Why does this work?

When I was doing a math exercise that required me to convert fractional decimals into binary, I noticed that $0.75$ and $0.875$ had similar binary forms, $0.11$ and $0.111$ respectively. So one thing ...
ShadowTempestWolf's user avatar
2 votes
1 answer
204 views

Why does my TI-84 evaluate this expression involving pi to a whole number?

While working on some homework tonight, I entered the following expression into my TI-84 Plus: $$\frac{(90×0.006)}{(\pi/4×0.006^4)}$$ I did a double-take when I saw that the output was exactly 530,516,...
leavesy's user avatar
  • 23
-1 votes
1 answer
118 views

The sum of the probability of an event and its negation is not exactly 1?

the probability of an event is $(1-0.00015)^{16}$ and its negation has probability $16*0.00015-0.00015^{16}$ but their sum is: $1....
curiousCprogrammer1231's user avatar
0 votes
1 answer
71 views

Why Linear regression using Numworks calculator doest give exact result

I tried to do a simple linear regression using the "Numworks" calculator and unless I add many more data points or add a point where x=0 it doesn't give me the correct equation. Could ...
skyde's user avatar
  • 143
-3 votes
1 answer
111 views

How PEMDAS,BODMAS are true in this case [closed]

If we look at this expression $\frac{A}{B + C}$ It looks like it is simply $A ÷ B + C$ But the calculator does it as $A ÷ ( B + C )$ Why does the calculator do it like this as in the first place there ...
Abrar Lodhi's user avatar
0 votes
0 answers
124 views

How to quickly approximate a value

If you had to approximate the value of $\frac{10^6 - 11}{2^{12}}$ quickly and in your head, how would you do it? (The real value is 244.14) The way I done it on paper was $\frac{10^6 - 11}{2^{12}} \...
idk31909310's user avatar
-1 votes
1 answer
99 views

Why is the binomial coefficient button labeled nCr on most calculators?

Most of the time I see the binomial coefficent explained using the variables $n$ and $k$: $${\binom {n}{k}}={\frac {n!}{k!(n-k)!}}$$ I understand that the C stands ...
no1dea's user avatar
  • 77
2 votes
1 answer
203 views

Why does the TI-30X Pro calculator seem to get the derivative of $\sin(x)$ at $x=0$ wrong?

I typed the derivative of $\sin(x)$ at $x=0$ into my calculator, and it outputted $0.0174...$ I was expecting the answer $1$. What went wrong?
no1dea's user avatar
  • 77
1 vote
1 answer
896 views

Syntax Error when multiplying by a negative number

I just got a new calculator it's the Ti-30X Pro MathPrint. (I belive that it is not sold in the US). When I try to multiply by a negative number, say (-1) to change the mathematical operator I get a ...
user avatar
1 vote
1 answer
423 views

How does a calculator calculate binomial coefficients for large $n$?

I've got an interesting puzzle. I'm playing around on a Casio fx-991EX and I notice it has a binomial distribution function. Trying to see how large of a value of $n$ it could take, thinking that in ...
Jake's user avatar
  • 245
5 votes
0 answers
185 views

Randomly pressing buttons of a calculator [closed]

There's a normal scientific calculator with only $12$ buttons: from $0$ to $9$ and $+-$ Randomly press these buttons $n$ times. What will be the math expectation of the result? (Imagine that the ...
SundayLi's user avatar
  • 184
6 votes
5 answers
260 views

Why is % difference of aggregation higher than individual % differences?

I'm calculation the % difference in completion rate (before vs after) of Product A (0.3%), Product B (16.7%) and the combination of Product A and B (17.0%). I'm unable to explain why the combination ...
QueryStack77's user avatar
0 votes
3 answers
129 views

A large discrepancy evaluating $\int_{5.566}^{5.568}\frac{(\sin 6x)^{14}}{(\cos 11x)^{8}}dx$ with Hiper Scientific Calculator vs WolframAlpha

So, in a nutshell, dealing with Hiper Scientific Calculator and Wolframalpha Integral Calculator . Only this integral $$\int_{5.566}^{5.568}\frac{(\sin 6x)^{14}}{(\cos 11x)^{8}}dx$$ is being strangely ...
A B's user avatar
  • 9
0 votes
0 answers
193 views

Calculating the information entropy of a discrete signal on a calculator

In the last few days I've found myself having to calculate the entropy of a discrete symbol source (which emits one symbol chosen among a finite set with corresponding probabilities). The formula is ...
none none's user avatar
  • 101
2 votes
1 answer
67 views

Not getting the right derivative of $(x-a)\arctan\frac{(y-b)(z-c)}{(x-a)\sqrt{(x-a)^2+(y-b)^2+(z-c)^2}}$ with respect to $c$

Derivative of: $$\left(x-a\right)\arctan\left(\dfrac{\left(y-b\right)\left(z-c\right)}{\left(x-a\right)\sqrt{\left(x-a\right)^2+\left(y-b\right)^2+\left(z-c\right)^2}}\right)$$ w.r.t. $c$ is, ...
lorilori's user avatar
  • 556
0 votes
1 answer
90 views

Why wolfram alpha is not showing integrand error?

$\tanh^{-1}$ of any real number whose modulus is $1$ or greater than $1$ is meaningless. So the following double integral must be meaningless. But when I computed the following double integral in ...
lorilori's user avatar
  • 556
0 votes
2 answers
649 views

What does italic i mean in integral calculator?

In Wolfram Alpha I computed the following double integral: What does $i$ mean here? Does the result have imaginary part also?
lorilori's user avatar
  • 556
0 votes
1 answer
113 views

TI-84 Matrix Fractions Question

Apologies if this isn't the place to ask! I use a TI-84 CE. When I run the RREF for saved matrices, I often get decimals returned in the output. I'm wondering if there's a way to consistently convert ...
ant's user avatar
  • 61
0 votes
1 answer
97 views

Diagonalization calculator of definite quadratic forms using the "completing the square" method

In this question: Calculating the maximum value of a quadratic polynomial on several variables with some restrictions, I asked about finding the maximum value of a certain quadratic polynomial with ...
user302934's user avatar
  • 1,600
0 votes
0 answers
38 views

Testing the the truth of the hyperbolic functions on a calculator.

Test the truth of the formula $\cosh ^2 x-\sinh ^2 x=1$ on a calculator you will probably find that the output changes from 1 to 0 somewhere between $x=10$ and $x=20$. Why is this? Should we conclude ...
emil agazade's user avatar
-2 votes
1 answer
83 views

Why can't I compute $(-2)^\frac28$ using a calculator?

Why can't I compute $(-2)^\frac28$ using a calculator?
Dogo's user avatar
  • 1
0 votes
1 answer
90 views

Casio fx-100AU COS calculation error

I am calculating the following on my Casio fx-100AU: 7.5cos((2pi/365)*24)+21.5 -> 28.99980502, which is incorrect it should ...
user5063987's user avatar
1 vote
0 answers
83 views

This is a question about graphing calculators, the TI-84 Plus, etc ones. How do I connect them to my laptop?

All of the videos and information I can find about connecting TI-84 Plus/etc calculators to laptops are outdated. And the only type of cord I can find is this with the end that's too large for my ...
user20285155's user avatar
0 votes
0 answers
129 views

Computing Multivariable Definite Integral On TI-Nspire

Whenever I try running the following integral on the Ti-Nspire, I get an "undef" error: integral (0,inf) of x^2 * (1/y)^(-x/y) dx
fruitbowl97's user avatar
0 votes
0 answers
21 views

initial current and voltage estimate from the equation

There is a paper called [Real Time Hardware-in-Loop Implementation of LLC Resonant Converter at Worst Operating Point Based on Time Domain Analysis][1] I am trying to derive equations 25 and 26 from ...
Magnetic778's user avatar
0 votes
0 answers
3k views

Is it possible to calculate z-score given the probability using a casio calculator?

I have a casio fx-991EX CLASSWIZ calculator and I would like to know if it is possible to calculate the z-score knowing the probability. Every source I found explains the inverse (calculating ...
BillTheKid's user avatar
1 vote
0 answers
37 views

Creating an equation that will return a linear result

I am a web developer and I need to create a multiplier between 1 & 10 or as close as possible. I have a variable value that is essentially a date range in days (1 day ago = 1, 10 days ago is 10... ...
Doopz's user avatar
  • 111
0 votes
0 answers
17 views

Question on graphing space curves in a plane

This is from Gilbert Strang's Calculus Book, on the section of partial derivatives. I am not sure at all what this means. How can you graph 3 variables in a TI-81 calculator (which is what I assume ...
Inquisitor's user avatar
2 votes
1 answer
159 views

Calculator - Why can I not calculate 7F FF FF FE * 2

I just tried to calculate on my CASIO fx-991 ES the following equation: $7F FF FF FE_{16} \cdot 2$ and $7F FF FF FE_{16} + 7F FF FF FE_{16}$ My result was MATH ERROR. I therefore expected I ...
TheCommoner282's user avatar
2 votes
0 answers
49 views

Computing log of a number with low precision calculator

Say I have a low-precision calculator that displays numbers with only 8-digits mantissa. For example, 0.00432137378 would read ...
fricadelle's user avatar
2 votes
1 answer
68 views

How to solve for m in this equation without using the quadratic formula

Tangents drawn from (b,a) to the hyperbola $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ makes angles $\theta_1$ $\theta_2$ with the x-axis. If $\tan\theta_1$$\tan\theta_2$ =2 then $b^2-a^2=....$ The equation ...
user avatar
0 votes
1 answer
53 views

Distribute percentage of quota % evenly

Let's say I have 65% of a company and my partner has 15% of the same company, so together we both have 80% of the company. We want to give a new partner 7% of our company, and for that to happen, we'...
ludicrous's user avatar
  • 653
26 votes
3 answers
1k views

Why do different calculators disagree on $\cos(452175521116192774 )$?

I want to calculate cosine of 452175521116192774 radians (it is around $4.52\cdot10^{17}$) Here is what different calculators say: Wolframalpha Desmos Geogebra Python 3.9 (standard math module) ...
musava_ribica's user avatar
0 votes
0 answers
64 views

Calculator Confusion: fractional roots of negative numbers [duplicate]

(Calculator type: Sharp EL-W531) When I put in the power (-0.2)^(-4/5) it says "calculation error." Is this not just raising $(-0.2)^{-4}$ then taking the ...
photon's user avatar
  • 29
3 votes
1 answer
334 views

How do I multiply using this "Addiator"-style calculator?

I've got an old "Addiator"-style calculator (pictured below), but not the instruction manual. I know how to use it to add (place the stylus next to a digit and pull down, pushing up and ...
Mark's user avatar
  • 740
0 votes
0 answers
24 views

Quickest way to do n/(n+m) on a 4-function calculator

Let's say the problem I want to solve is: I have n "widgets" and m "doodads". I want to know what percentage of the total items are widgets. Let's say I only have a basic 4-...
JoeMjr2's user avatar
  • 101
0 votes
0 answers
91 views

Why does my calculator say that the cube root of $0$ is "Infinite"?

In all my years, I have known that $0^x = 0\space\space\forall\space\space x \in \mathbb{R}^+ - \{0\}$. Today, I tried calculating $\sqrt[3]{0}$ on my phone calculator, but I get an unexpected result ...
Extr3mis's user avatar

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