Questions tagged [calculator]

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

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1answer
11 views

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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1answer
22 views

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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2answers
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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1answer
97 views

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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0answers
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 ...
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0answers
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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1answer
47 views

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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53 views

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}{\...
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1answer
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 ...
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1answer
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 ...
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3answers
31 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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0answers
23 views

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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1answer
59 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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1answer
33 views

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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1answer
71 views

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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0answers
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 ...
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1answer
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 (...
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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 ...
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0answers
39 views

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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44 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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3answers
35 views

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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1answer
33 views

Can you help me to prove that $(\log(x))!>x^2$ [closed]

Can you help me to prove that $(\log(x))!>x^2$
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1answer
36 views

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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2answers
59 views

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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0answers
34 views

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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2answers
51 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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2answers
1k views

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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1answer
26 views

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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34 views

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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2answers
63 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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1answer
405 views

The Broken Calculator Problem

So here is the Problem :- Tom has a specific calculator . Unfortunately, all keys are broken except for one row$: 1,2,3,+,-$. Tom presses a sequence of $5$ random keys; where at each stroke, each key ...
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33 views

Graphing Parametric Functions Ti-84 Plus CE

I am currently studying for the Math 2 SAT and when dealing with Parametric equations I tend to graph them. I recently tried graphing the parametric equation: ...
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1answer
33 views

Write a For … Endfor in the scratchpad on TI nspire CAS

I would like to write on the scratchpad a for loop (I don't want (because I don't know how) write a program on my calculator). I have set in memory : ...
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1answer
286 views

Any good math calculators online to find inverse laplace transforms? Specifically $s\log\frac{s+4}{s-4}$

I think I have found the final answer $\left(4 \left[\frac{2t \cosh(4t) - \sinh(4t)}{t^2}\right]\right)$ but need to verify it.
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1answer
170 views

Logarithm value difference between calculator and table

Look at the example given at the bottom of the attached table. Log(0.003674) = -3.5652. I understand how this is procured from the log table. But if you use a calculator and plug in the numbers ...
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1answer
32 views

I am trying to find the zeroes of this polynomial

Polynomial: $$(8.0\times10^{29})(0.010-x)(1.99\times10^{-7}-4x)^4-x=0.$$ No matter what I do can't get the graph to show up on my calculator (TI-83 plus) when I use the graphing function, so I can'...
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1answer
41 views

For standard deviation of grouped data shouldn't you have to convert frequencies given in decimals (in millions) to whole numbers.

A client of mine in Finite Math received the following data and was asked to find the sample standard deviation. (Actually, they don't specify 'sample'. This class doesn't seem to teach population ...
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1answer
297 views

Compound Interest Formula for monthly deposits

I am currently developing a savings calculator to some set requirements, such as using a compounding interest formula. My calculator currently is annual interest only, and compounds only annually as ...
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0answers
106 views

TI Inspire CX CAS unable to do integral

Here is the math problem I am trying to do: So I want to take the integral of v(t) to get s(t) then solve for c. I typed in v(t) in my ti inspire cas, assuming it would simplify it down. However it ...
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1answer
46 views

TI Nspire CAS Implicit Differentiation not returning correct result (returning 0)

Taking the derivative of $y^3-xy=2$, the correct result should be $y'=y/(3y^2-x)$. However, when I use the impDif() function on TI Nspire CAS, the returned result is 0, as shown in the screenshot ...
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2answers
550 views

Understanding a calculator: what does “sign” mean?

I put the following input into a ti-nspire cx CAS: and it returned: What does "sign" mean?
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3answers
90 views

Matrix Calculator Tools

Does there exist any such software/online calculator where I can enter a matrix and am able to obtain the formula for an arbitrary power of the matrix? It would be an added benefit if the entries of ...
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1answer
632 views

How to find percentile of exponential distribution with ti-84 [closed]

Hello I am taking an online statistics class as part of a nursing program that I am in and we are using a free online textbook from lumenlearning. I am currently learning about uniform and exponential ...
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4answers
141 views

Values of $\left (1+\frac{1}{n}\right )^n$ on a calculator

I was reading a calculus book, and at some point the following standard limit was mentioned: $$\lim_{n\to\infty}\left(1+\frac1n\right)^n=e$$ Afterwards, the author of this book invited the reader to ...
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80 views

Finding Poisson Critical Region with Casio CG-50

I am trying to figure out how to get the critical region for a Poisson distribution on a CG-50. On the classwiz, you could enter desired values into a table and the poisson value would be returned on ...
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1answer
50 views

Are there formulas to find roots of n-th degree polynomials?

I have tried a polynomial equation of 7th degree on WolframAlpha but it didn't give me exact forms. Does this mean there are not general formulas for every polynomial equation and calculators use root-...
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1answer
223 views

How does the calculator solve definite integrals?

What process do most calculators use to calculate indefinite integrals? My teacher told me that calculators are really good at doing definite integrals, but they aren't so good at finding the ...
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1answer
24 views

help needed with a percentage calculation [closed]

so in this example when i calculate 10000+1% its shows 10100 but with my casio fx 991 es plus shows 10000.01 please help I'm stuck
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0answers
27 views

result in math mode like radicals and fractions on casio fx-992

I want to solve the equation $$ z^2 -(\sqrt{3} +\mathrm{i}\sqrt{2}) z + \mathrm{i} \sqrt{6}=0 $$ Using the casio fx-992 plus calculator. To do this, I followed the instructions given in this video: ...
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1answer
37 views

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?

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