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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Statistics Problem CI Interval

I have an issue with a particular problem that I have from my probability and statistics class. I have a data set that represents a random sample from a normal distribution: ...
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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 ...
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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 ...
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Online site for determining if a column or integral converges [closed]

I'm looking for an online calculator that shows whether a given column or integral converges, and the stages it does to prove it. Know any?
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23 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-...
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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 ...
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2 answers
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Why calculate cos on different calculator get different results?

I just recently start to learn cos. I found out when I use different calculators to calculate cos, sometimes may get different results which is quite confusing. For example, cos(35), I am calculating ...
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3 answers
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Is $a^x \pmod{n} = (a\pmod{n})^{x \pmod{n}}$? [closed]

Is it right to claim that: $a^x \pmod{n} = (a \pmod{n})^{x \pmod{n}}$? I know that: $a^x \pmod{n} = (a \pmod{n})^{x}$?
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Can anyone figure out the functioning of this Ukranian 1917 pinwheel calculator?

I have bought this online, but cannot for the life of me figure out what it does. It says "composition" at the top and "reading" at the bottom. There are columns of numbers with a ...
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is it safe to use Trigonometric of large number in pocket scientific calculator

In this book (from 90s), there is a suggestion to reduce angle interval down to between 0 and 360 degrees, when the angle is larger than $360^\text{o}$ or when the angle is negative. So here is my ...
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TI 84 Plus CE with Python not able to handle complex polar form in degrees.

I am aware that the TI 84 calculators only allow the angle for complex polar form to be in radians. On my old TI 84 (I just got a new TI 84 Plus CE), I could work around this issue (no matter what ...
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How to compute week and month wise percentage from day wise percentage?

I have day wise participation percentage for a group of customers, for the whole year. My data is as follows: Day 1: 100% Day 2: 50% Day 3: 0% Day 4: 12% Day 5: 2% and so on till Day 365: 0% My ...
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Why does Wolfram Alpha give different answers to this algebraic equation depending on how it is entered?

I am trying to solve the equation $Ce^{-\sqrt L t} + De^{\sqrt L t} = Ce^{-\sqrt L (t + 2m\pi)} + De^{\sqrt L (t + 2m\pi)}$ for $L$. Here Wolfram Alpha returns the solution $m = \frac{in}{\sqrt L}$, ...
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How to calculate the result of a recursive equation?

I'm looking for a tool (like Wolfram Alpha) that can calculate the result of $ B(P,N) $ Where $B(P,N)$ is a recursive function defined as follows: $ \left\{\begin{matrix} B(P,N)=\frac{-(-1)^{\frac{N}...
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1 answer
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How Do I Display Fractions on Graph on a TI-84 Plus Calculator

I would like to be able to see the result of a "Trace" or "Calc" operation in a fraction form when on the "Graph" screen of a TI-84 Plus. I assume that this is either a ...
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1 answer
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Problem using Casio fx-991CE X calculator to solve "e^(i*pi)" [closed]

I'm trying to solve e^(i*pi) on a Casio fx-991CE X calculator. The calculator is in Complex mode (MENU>2:Complex). I Input e^(i*pi) and press "=" and get an error message instead of -1. ...
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Desmos factorial error

Desmos gives an undefined value for the factorial function for integers greater than $169$ (which just so happens to be $13^2$). The reason is that desmos uses a 1024-bit system, and apparently, it ...
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1 vote
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265 views

Where can I find a calculator for constrained optimization of general form of algebraic equation?

I'm working with a fairly complex equation and I need to carry out constrained optimization of the same. The first order differential equations are very messy to solve by hand and hence I thought to ...
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Fractional part on TI-36X Solar calculator - Or equivalent function

Newer Texas Instrument calculators have the Fpar() function which gives the fractional part of a number. However I'm only allowed to use a calculator without graphing capabilities such as for example ...
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2 answers
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Confusing calculator result

I was doing some simple maths for a project when I stumbled upon an error (?) in my calculator (casio fx 991), I'll explain: I wanted to make the next rule of three calculation: $$ \frac{x}{4}=\frac{0....
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1 vote
2 answers
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Are expressions including radicals particularly difficult to integrate numerically?

I noticed some unusual result errors when numerically integrating using a TI-84 Plus CE. This answer explains that the TI-84 uses a 15-point Gauss-Kronrod method with a maximum error of $10^{-5}$ to ...
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Why do horizontal translations of graphs of $\log(x)$ have "gaps" in them? [closed]

Why do horizontal translations of graphs of $\log(x)$ have "gaps" in them? For example, the graph of $y = \log(x+2)$ has a gap at around $y = -15.3$. Aren't logarithmic functions supposed ...
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3 votes
2 answers
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When do we use common logarithms and when do we use natural logarithms

Currently, in my math class, we are learning about logarithms. I understand that the common logarithm has a base of 10 and the natural has a base of e. But, when do we use them? For example the ...
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1 answer
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How to find the number of trials for a binomial distribution using a GDC?

I am given a discreet random variable X that satisfies the binomial distribution with p = 0.5 and number of trials 2n. I also know that P(X=n) is 0.273. I have to find the value of n and I am expected ...
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1 answer
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How can I calculate the right ratio [closed]

I m currently preparing for sat subject mat 2 exam and whenever this type of question comes , answer that my calculator gives and the answer key says doesn't match. Does anybody can help , maybe ...
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2 votes
2 answers
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$|2\sin^2 x-1|>\cos x$: graphic and analytical method resolution

I have this inequality $$|2\sin^2 x-1|>\cos x \iff |\cos(2x)|>\cos x \tag 1$$ or equivalently to $$|1-2\cos^2x|>\cos x \tag 2$$ To solve the $(2)$ is trivial by taking it to an absolute value ...
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2 votes
1 answer
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Calculation in geometrical interpretation of Lagrange's equation

I was reading the geometrical interpretation of Lagrange's equation and there it was written that if $f(x,y,z)=0$ be the solution of the Lagrange's equation $Pp+Qq=R$, then the direction cosines of ...
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1 vote
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837 views

How to draw a point moving on a circle with Desmos graphing calculator?

This is a soft question. It's not difficult , say, to draw a point moving on the $y=x²$ parabola with Desmos. One can first declare that $b= a² $ , then define point $P$ as $P=(a,b) $ , and finally ...
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How to read this number: 2 - 3e-4

e in this case is not the euler number. Would I read this number, $$2 - 3e-4$$, as $$2 - 3 * 10^{-4}?$$ thanks
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1 answer
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Circle Sector Area Calculation - I am getting wrong answer

I am trying to calculate the area of a circle segment using MS-Excel. The radius value is stored in variable "rr", the angle is stored in variable "a". There are 2 equivalent ...
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total cost of membership over period at set growth rate per renewal

I need to calculate a membership cost. The first year's membership will be £530, the second year will be £530 + £25, so £555.Every year, the renewal will be an additional £25, so year one = 530, year ...
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3 answers
447 views

Can a calculator find any limit?

I am using CASIO fx-991ex and I noticed through my homework that when x approaches infinity or zero it's almost like using big or small numbers in calculator. For example $e^x$ while $x$ approaches $\...
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1 vote
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Graphing Tool that allows for Manually entered X axis Points

I've been looking for ages and either cannot find the tool or figure out how... I would like to plot a graph with the y=1/5(104-2(x/20+20/x)) but the graph with normal scaling is useless. Log scaling ...
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1 vote
1 answer
263 views

Fastest way to implement Secant method on calculator

I am looking for the fastest way to implement the secant method (the one which is used for finding roots to a given single-variable equation) on a fx-991es calculator (scientific, non programmable ...
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1 vote
1 answer
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Calculator or another way to find the $a_n$ of a function

$$ a_{n+2} - 2a_{n+1} - 3a_n = 0 $$ I have this with $a_0=1$ and $a_1=2$. $$z^{-2}\left[A(z)-a_0-a_1z\right]-2z^{-1}\left[A(z)-a_0\right]-3A(z)=0$$ Then I solve this $A(z)$ and I replace the values $...
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Scientific Calculator without Memory or Exponents

My chemistry teacher requires us to use a scientific calculator that does not have memory, storage, or exponents, but I'm having trouble finding one. Does anyone know of a calculator that meets the ...
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1 vote
0 answers
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Ceiling function on TI-84 Plus

I am the owner of a TI-84 Plus CE-T and recently I was trying to solve a problem in which a ceiling function was required. I could not find an option to do this in the mats menu, or any of the other ...
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1 answer
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Finding a calculation formula to convert different units

A solution to my problem definitely must exist somewhere online, but I definitely don't know the right terminology to find it. Essentially I am making a quick script to convert measuring units of oil (...
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2 votes
0 answers
94 views

The Strong Law of Small Numbers on Calculators

This question is in the spirit of Guy's Strong Law of Small Numbers, and also the following two questions Examples of patterns that eventually fail Conjectures that have been disproved with extremely ...
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0 answers
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Using a graphing calculator to find values in interval that satisfy Mean Value Theorem

$f(x) = 2^x - \sin x, [0,π]$ I believe the question wants me to find the values x within the interval that have the same slope as the secant line? The secant line would be: $$ f'(c) = \frac{f(π) - f(...
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160 views

PFE with complex roots on TI-89

How to do partial fraction expansion with complex roots on a TI-89 (i.e. from formula #1 to its expansion form #2)? With real roots, I could use the Algebra/expand()...
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2 different solutions on 2 calculators

I used Photomath and Microsoft Math to compute an equation, but they gave me two different results (-411 and -411/38) Why did that happen and which is the correct answer? https://i.stack.imgur.com/...
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1 vote
1 answer
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Is Desmos Malfunctioning? [duplicate]

For the function: $f(x)=5x^3-10x$ we find the zeroes to be: $x=0, \sqrt{2}$, and $-\sqrt{2}$ However... If you let $a=\sqrt{2}$ or $-\sqrt{2}$ in $5a^3-10a$ Desmos evaluates and says either of those ...
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-1 votes
2 answers
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Why does calculators have differing limits reaching $\infty$? [closed]

Discovering that $\infty$ can be varied, it might make sense that very big numbers will limit theirselves to become $\infty$. I went to use my phone for experimenting this. Once I reach $1e309$, it ...
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Is there a coordinate geometry calculator

I am looking for a calculator where I can input the coordinates of some points, connect some points, and find the intersection of lines (as coordinates). Does something like this exist? Ideally, it ...
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1 vote
2 answers
89 views

Combination Feature of Probability Question

We are given the following scenario: A nursery claims that 80% of its trees survive at least three years. As part of a service learning requirement, you are landscaping a neighborhood park and have ...
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2 answers
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Why is there a constant 1 in the compound interest formula?

(This is about my calculus project) I am curious about why there is a 1 in the compound interest formula. Like what does the 1 do in the function? $$A(t)= P (1+\dfrac rn)^{nt}$$
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-1 votes
1 answer
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Calculator gives a different answer than online math websites - exponents

I am quite confused with the different answers obtained when I inputed an equation into a physical calculator and an online math calculator. The equation was: (6.67×10e-11)×(5.97×10e24)×(7.35×10e22)÷(...
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TI nSpire CX CAS impossible answer

My input to my TI nSpire CX CAS was: $solve(\frac{r\cdot (p+q)}{p\cdot q}<5$ and $p>0$ and $r>0$ and $q>0,p)$ The first answer it gave was $0<p<\frac{-q\cdot r}{r-5\cdot q}$ and $r-5\...
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0 votes
2 answers
71 views

$(-10)^\frac{1}{3}$ comes out to be imaginary [duplicate]

The expression $\displaystyle (-10)^\frac{1}{3}$ returns errror when calculated with scientific calculator returns an imaginary number. But it's power is $\dfrac{1}{\text{odd number}}$.
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