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Questions tagged [calculator]

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

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1answer
19 views

Steps for solving amortizing payment formula using handheld calculator

What are the steps for solving this equation on a handheld calculator? Where should I start? I know many calculators have functions to do this quickly, but this is more a question about using a ...
0
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0answers
30 views

TI-89 Titanium is missing functions [on hold]

I recently received a TI-89 Titanium from my school for use in a club. However, I found that it's missing some built-in functions in the catalog (isVar, isLocked, root, maybe more). When I press ...
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0answers
13 views

How can I plot spherical coordinates in Graphing Calculator 3D? [closed]

I can never find the spherical coordinates. help.
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0answers
11 views

Any graphing calculator programs and/or methods for Game Theory

are there any programs and/or strategies that will help me solve for nash eq's of various games, prisoners dilemma, pure strategies, mixed strategies on my ti-84 graphing calculator?
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0answers
37 views

TI-nspire CX CAS giving weird/incorrect indefinite integral

I am testing out the new TI-nspire CX CAS I just got with some simple indefinite integrals. I used the integral of $$ \int \sec^3(x) dx $$ My nspire gives me: $$ \frac{\cos^2(x)\ln\left(-\frac{|\...
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1answer
40 views

Calculator giving weird answer when dividing factorial

I am using a TI-34 MultiView I was trying to divide the following 20!/(17!3!) The answer should be 1140 right? the numerator is 2.43*10^18 the denominator ...
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0answers
22 views

Is there a way to input a variable (such as x) into my calculator for use with integrals or derivatives?

There is a button on my calculator dedicated to derivatives and integrals, but I've never been able to use it because I don't know how to represent a variable (it seems the only thing I can derive or ...
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0answers
26 views

Casio fx-cg50 CALC equivalent

Not sure if this is the right place to ask but I just got an fx-cg50 after having a classwiz for about half a year. The class wiz had a function called CALC where you could sub in different values of ...
2
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2answers
69 views

Integrate $\int 2x\sin{(x^2+x)} \,dx$

Evaluate $\int 2x\sin{(x^2+x)} \,dx$ using integration by parts. Let $u=2x$ and $dv=\sin(x^2+x)dx$ and I got that $du=x^2dx$. I'm stuck when integrating $\sin{(x^2+x)}$. Then I tried the integral ...
2
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3answers
81 views

why cant algebra calculators without graphing involved solve this equation $2^x=3x-1$?

I know you can plug in 1 and get the answer, but im curious as to why some websites with algebra calculators cannot solve the equation unless the website has some sort of graphic calculator also ...
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4answers
809 views

How can $\frac{4}{3} \times 3=4$ if $ \frac{4}{3}$ is $1.3$? [duplicate]

Ok use your closest calculator, and type $\frac{4}{3}$, which is $1.3333333333$,and then multiply it with $3$ which is $3.9999999999$ but then type $\frac{4}{3} \times 3=4$ how?. How can it be $4$ if $...
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1answer
48 views

Writing Short Equations/Equivalents For A Group Of Numbers.

I have a series of numbers between 0 to 16,000,000. It's certainly possible to describe some (if not all) of these numbers with some equations. For example, it's possible to write 720 as 6! and 5040 ...
1
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1answer
55 views

Difficulty understanding trigonometric functions

I have taken several calculus classes as part of highschool and general science degrees. Sin, cos, tan, and their inverse functions have always been this 'black box' to me that I never understood... ...
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0answers
31 views

How to do Monte Carlo Method for exceedingly large numbers?

For a paper I'm writing for my math class, I need to do several Monte Carlo simulations for a game I'm playing. The $p=0.6190411273$, a normal number... but the $n=2.14974(10^{10})$. I've tried to run ...
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0answers
15 views

Making a pension calculator to find monthly deposits

Im trying to make a pension calculator to find out how much you need to contribute to your pension each month in order to reach your retirement goal. For instance, let's say you want £250,000 when ...
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votes
1answer
29 views

Divide money and things equally between room mates [closed]

My friend and I spent 12730₹ in total to buy some house hold things(say some 10 items). We shared and paid equally. Now we are vacating so we have to divide the items, but my friend wants only 2 items ...
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2answers
31 views

How to calculate the size of this table top? [closed]

Now, I have the table with legs 73cm and the table top 65x50cm. What will be the size of this table top if legs are 48cm? Need it to save proportion.
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2answers
88 views

How can I calculate ${2133}^{5525}$ mod ${7387}$? [closed]

I would like to calculate the modulus of a large number. How can I do it? Is there an easy way to calculate it, without really using the calculator? How can I get these solutions? ${2133}^{5525}\pmod{...
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2answers
39 views

how to integrate $\frac{-1+e^{-i k x}}{x^2}$

How do I integrate the following?$$\int_{-\infty }^{\infty } \frac{-1+e^{-i k x}}{x^2} \, dx$$ I am not very familiar with complex analysis, but I did try to use contour integral to do this but I ...
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votes
2answers
23 views

Time and work concept [closed]

$L$, $M$, and $P$ can do a certain piece of work in $15$, $20$, and $40$ days, respectively. They started the work together. M left the work after $4$ days of starting and $P$ left the work before $3$ ...
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3answers
35 views

What will be the input based on the output?

A = 1.0 B = 1.0 C = A / (1-(B/100)) This will give an output as 1.01 What will be the output when A and C are only given? A = 1.0; B = ?; C = 1.01; 1.10 = 1.0 / (1-(? / 100)) What is the answer ...
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1answer
35 views

what is exact formula of round off 5 cent? [closed]

I want to round off the amount in 5 cents. I tried that formula amount = amount+0.05; amount = amount *5; amount = amount /5; is this correct?
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0answers
21 views

numerical analysis and weakness of calculator

Suppose that our calculator can calculate $e^x$ so well.But its program for calculating $\ln (x)$ is poor. How to improve the accuracy of $ln(x)$ by using the fact that $$ln(a)=b+ln(1+\frac{a-e^b}{e^...
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1answer
89 views

TI - 89 : Equation solver not displaying multiple solutions

I am trying to solve an equation 135 degrees = -(arctan(f/(10^5) + arctan(f/(3.16*10^5))+arctan(f/(10^6)) . When I enter this equation using the solve function on the Ti-89, it gives a single ...
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1answer
58 views

TI 89 vs TI 84 Plus CE [closed]

I am currently a sophomore in high school taking Algebra 2 and Precalculus in the same year. Junior year I’ll be taking AP BC Calculus and then Senior year Multivariable Calculus. I currently have a ...
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0answers
56 views

Solving a logistic regression problem with my calculator gives “singular matrix” error. Why?

In my homework, I was given the following problem: The following data represent the population of a country. An ecologist is interested in building a model that describes the population. $$\...
2
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3answers
55 views

$\cos(\pi/6 *2\pi)$ in radians isn't equal to $\cos(30*360)$ in degrees why?

I put $\cos(\pi/6*2\pi)$ in radians mode on my calculator and i get $-0.9890273166$ and then I put $\cos(30*360)$ in degrees mode and get $1$, the answer is the complete opposite of what it should be ...
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1answer
170 views

Function on HP Prime calculator to get Symbolic expression of Fourier transform from Laplace transformation

I would like to have a simple algorithm (or function) on HP Prime calculator to get symbolic expression of the Fourier transform of a function. On my HP Prime, it is possible to get the Laplace ...
2
votes
1answer
172 views

I can't graph lines on my TI-84 Plus

On my TI 84 Plus CE, I have $Y_1$ and $Y_2$ filled with equations, both under Plot 1. When I select Plot 1 and press enter to select it to graph, the plot doesn't show up under graph. Instead, I see a ...
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2answers
42 views

math problem with exponent [closed]

I have this formula for a game where you gain so-called "skills" depending on how many hits you make on a monster in the game. To go from skill 97 to 98, I can calculate the amount of hits by doing: ...
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1answer
236 views

How to solve 3^x = 2187 by using Casio fx-85GT plus

I need to solve 3^x = 2187 by using Casio fx-85GT plus and I couldn't find anything in its manual. I know how to do it manually and the answer is "x = 7". But how can I do it using the calculator. ...
0
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1answer
35 views

Calculating complex numbers with my TI-84+

I got a problem wrong and I don't understand how. The question was to compute: $\sqrt{-1875.5+9.68i}$ I said this would be equal to .112+43.31i because that's the number my calculator gives me. ...
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0answers
25 views

Finance - C# into Math - Complex Equal Repayment Calculator [closed]

I've used Stack Overflow in the past I think on this occasion my issue steps over to mathematics. I'm working on a method which no one knows about, its quite old and not commented. I believe what ...
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1answer
18 views

Geometric row/column Sum Pattern in any numerical calculator

By random luck I found this intriguing geometric pattern of summing in the numerical keypad. I'm curious if it is related to the base 10 system or how the numerical keypad was arranged, but couldn't ...
2
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2answers
152 views

Multidimensional chain rule, online calculator

I would like to check my solutions for the derivative with the multidimensional chain rule, and I would like to do that online with a calculator. But I can not find one and I do not know how to use ...
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1answer
742 views

What can the comma symbol be used for on the CASIO fx-85ES PLUS scientific calculator?

Please note that this question may or may not be connected to this stack exchange. If it is not, please help me transfer it to the correct one. Scientific calculators have always have that comma or ...
2
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2answers
323 views

What algorithm do scientific calculators use to calculate Logarithms

I have been introduced to numerical analysis and have been researching quite a bit on its applications recently. One specific application would be the scientific calculator. From the information ...
7
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5answers
567 views

How does a calculator determine $\sin(x)$? [duplicate]

I've been wondering this for a while and it may be obvious but I can't think of how it works. From my understanding, to calculate the sine you'd do opposite side length/hypotenuse side length, but the ...
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0answers
44 views

Graphics Calculator for Computer Science applications

I'm looking for a really good, modern, standalone calculator; something particularly suited for engineering and/or computer science (as an educational tool). • I started with a basic Texas ...
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0answers
27 views

Problem with finding extreme values with TI84

I'm trying to find the extreme values of a function with TI84 plus CE. I have found the same instructions on several sites and in the manual. However, I don't get the correct resuluts. Example: f: ...
2
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1answer
201 views

How does calculating this method of calculating Log on simple Calculator Work?

In our finance course , we are allowed to use Simple Calculators that do not have a log function in them. We are provided with Log Tables but we are taught this trick to solve log without using log ...
2
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0answers
363 views

3D Graphing TI-Nspire CX

I'm trying to graph (x-6)^2+(y+3)^2+(z-2)^2=36. However, when I go to Graphs, Menu, View, and then 3D Graphing, I have to graph all 3D functions in terms of z. In order to graph this function, I ...
2
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1answer
48 views

Approximations for $\exp \left( \log^{f(x)} g(x) \right)$?

I am looking for approximations for $\exp \left( \log^{f(x)} g(x) \right)$. Obviously if $f(x) = 1$ this would simplify to $g(x)$. Is there anything else t do when $f(x)\neq 1$? Any upper-bound or ...
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1answer
22 views

Finding RPM for Peugeot and Honda car when only hp and lb ft are given?

Using an old copy of an automobile magazine, these are the cars with hp and lb ft I am trying to work out the RPM for (only power in hp and pulling power in lb ft are quoted) : 2007 Honda Accord 2.4 ...
2
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1answer
76 views

How to compute integral on calculator?

So i have this integral tending from 2(on top) to 1(on bottom ) of $$\int_1^2x\ln(x^2 +3)x\,dx$$ If I turn it into $x^2\ln(x^2 +3)\,dx$, with integration by parts I get $$\frac{16}{3}\,\ln(2) + \...
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1answer
101 views

Solving $79=A\log_{10}(2B+C)$, $72=A\log_{10}(4B+C)$, $62=A\log_{10}(6B+C)$

For a question, I was given a set of $x$ and $y$ values to substitute into the equation $y=A\log_{10}(Bx+C)$ and solve for $A, B$, and $C$. So I tried to type this into my calculator and solve for A, ...
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1answer
36 views

Different results on different calculators

On a casio 991ES plus (or any scientific calculator), 300+100% is equal to 301 but on the mobile calculator app, 300+100% is equal to 600 , why is this ? And is it possible to make the scientific ...
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1answer
38 views

What are some shortcuts for doing faster calculations? [closed]

In my way I face a lot of problems in solving the time consuming expressions sometimes I got the correct answer but sometimes not so I had so repeart the whole process again. Approximation is good but ...
4
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1answer
59 views

How to interpret basic interest problems on a financial calculator

I am having trouble understanding how to solve the basic problem of calculating $i$ given an annuity. For example, say we have that $a_{20}=13.35$. i.e , $$\frac{1-(1+i)^{-20}}{i}=13.35$$ Using ...
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0answers
28 views

Plotting unsimplified equations on a TI-84+ CE?

Is there any way to plot an unsimplified equation of x and y on my TI-84 without simplifying it into a y=... form first? I have an exam coming up where I am likely to need to visualize a fairly ...