# 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: ...
• 2,537
46 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 ...
57 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 ...
• 730
1 vote
27 views

### 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?
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-...
• 101
61 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 ...
• 51
85 views

### 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 ...
• 169
39 views

### 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: $a^x \pmod{n} = (a \pmod{n})^{x}$?
316 views

### 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 ...
58 views

### 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 ...
32 views

### 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 ...
• 101
105 views

### 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 ...
75 views

### 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 $m = \frac{in}{\sqrt L}$, ...
• 1,666
1 vote
### $(-10)^\frac{1}{3}$ 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 $\dfrac{1}{\text{odd number}}$.