# Questions tagged [calculator]

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

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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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### 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 ...
104 views

### $|2\sin^2 x-1|>\cos x$: 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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### 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 ...
15 views

### Simplex Tableau on TI Npire CX CAS

I am wondering if there is any way to create a simplex tableau on the TI Nspire CX CAS calculator and also be able to pivot it. If it is possible to do with the calculator it would be much easier than ...
50 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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### Mean of Exponential Distribution on TI-nspire CX CAS

I'm trying to calculate the mean (or expected value) of an exponentially distributed random variable X with rate parameter λ, as in Wikipedia: Exponential Distribution. \begin{align*} E[X] = \frac{1}{\...
31 views

### 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 ...
16 views

### 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 ...
31 views

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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 ...
253 views

### 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 ...
24 views

### 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 (...
72 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 ...
### Scientific calculator that can expands polynomial like $(x^2+1)(x+1)(x-3)$
Is there a scientific calculator that can expands a polynomal like $(x^2+1)(x+1)(x-3)$? Any scientific calculator like Texas Instruments can do that?