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

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votes
0answers
17 views

Is there a $\bar X$ button on the CASIO fx-991ES PLUS? [on hold]

So I have this calculator and we were doing mean exercises. In the calculator you got to write a few numbers with times then press a symbol like this: $\bar X$. I can't find it on my calculator and it ...
-2
votes
1answer
13 views

Solving basic Trigonometry equations on a Ti-84 Plus [on hold]

I am trying to solve some equations for example: tanθ = 2/4 or tan15 = x/30 but I do not know how I would use a Calculator to solve these as I do not know how to format them or which symbols to use ...
1
vote
2answers
2k views

“How much is it more/small than” calculator.

I need to find a calculator that will essentially give me how ever much a number is smaller/bigger than another number. Example: If I enter the two numbers '1' and '4'. It will tell me, ...
0
votes
3answers
90 views

How to check if the integral of a function is correct with a calculator?

As a calculus student I would like to know if there is any way to verify the "correctness" of an integral of a function using a calculator. I mean if have something like f(x) = cos(2X), the integral ...
1
vote
1answer
21 views

Calculator limits on a parabola

Hi guys I'm making Patrick Star for a graphing project. Anyways I'm using a parabola for his head on my TI-84 but when I set limits on it, it graphs a straight line. So the equation itself is ...
-3
votes
1answer
30 views

Symbolic operation on Ti-84 calculator [closed]

I want the calculator to answer with the parameter answer, not with a numeric value, I have tried to clear "M" variable with no success. Any idea? http://imgur.com/cHjfLln ( sorry I don't have ...
5
votes
2answers
131 views

Why are there conflicting results for integration?

Using my calculator, I had tried to evaluate the definite integral $$\int_{0}^{1}x^x \mathbf{d}x$$ However, according to my CASIO $fx-570$ES, the result was Math ERROR, which led me to believe that ...
0
votes
2answers
3k views

Enter “Int” on Casio graphical calculator

Hi I know this sounds like a really beginner question, but I cannot find how to enter the terms "Int" and "Ran#" into my calculator (Casio fx-9750GII) My code is thus: 1->L 100->H Int ...
4
votes
3answers
466 views

Wrong calculation by a calculator

Today I was working on some chemistry problems . Many of you might know it involves some big exponents. So today I just entered in one of my calculators (which might not be strong) as it was inbuilt ...
0
votes
1answer
36 views

How to correctly find CSC of an angle?

Alright, so one of my questions is CSC (angle) -5. When I plug CSC in my calculator, it says "math error." I'm using a Casio fx-300 MS, and using shift + cos, then putting an angle, such as 90.
1
vote
0answers
14 views

Program for General Form

I am trying to find the general form of the conic sections, however, I am not able to create a program that runs it. I know the way you find it is by using B^2-4AC but I would like to write a program ...
0
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0answers
17 views

Graphing calculator for third year undergrad applied modules

Can someone recommend me a good and affordable calculator please. I am going to sit exams like partial differential equations (method of characteristics related stuff), nonlinear dynamical systems and ...
0
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3answers
2k views

Graphing an ellipse on TI-nspire CX CAS

How do I graph an ellipse on a TI-nspire CX CAS? I know how to graph an ellipse with the equation $$\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2 }=1$$ but I don't know how to put coefficients in the ...
1
vote
0answers
49 views

How can I plot a phase portrait on Ti-Nspire?

I'm trying to graph the direction field and phase portrait of a system of differential equations, but I don't know how to. I can't seem to find any tutorials online. I can only graph slope fields.
0
votes
1answer
29 views

How to use the GDC to find median from probability density function

So, for example, find the median of the probability density function $f(x) = 1.13e^{-x^2}$ for $0 \le x \le 2$. I really don't know how to use the calculator to do this. I am using TI-84.
25
votes
6answers
2k views

Why does my calculator show $2^{-329} = 0?$

On my calculator, I usually get a $0$ when I divide something by $2$, a lot of times if that makes sense, but I was just wondering why does $2^{-329} = 0?$
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votes
5answers
232 views

Is $22/7$ an often used approximation for $\pi$?

It is $\pi$-day and the internet is full of stories about $\pi$. One story mentions that "an approximation -- $22/7$ -- is used in many calculations." I have never actually used $22/7$ as an ...
5
votes
4answers
148 views

Rational Exponents on Calculator

I'm confused as to why my calculator is saying that $$x^\frac{n}{n}=x$$ when $n$ is an even integer. I was under the impression that $$x^\frac{n}{n}=\sqrt[n]x^n=|x|$$ when $n$ is an even integer. ...
2
votes
0answers
58 views

Pocket Calculators- Obsolete? [closed]

I hope this fits into "software that mathematicians use" within the acceptable topics for this site. Are there still any instances where pocket calculators prove useful to professional mathematicians ...
0
votes
3answers
82 views

Why does my calculator show -2^2 as -4

I'm worried that this will be a spanner in the works when I'm using a calculator in an exam , I know that $-2^2= 4$ since $(-2) \cdot (-2) = 4 $. So why does my calculator show it as negative 4 ? Does ...
0
votes
3answers
68 views

Order of powers

Which of the following is $a^{b^c}$ equal to? $a^{(b^c)}$ or ${(a^b)}^c = a^{bc}$ This is probably a really basic question but I can't seem to find the answer anywhere.
4
votes
1answer
81 views

A nice way to do Euler's method on a calculator?

As part of the calculator paper for IB (International Baccalaureate), we may be asked to do Euler's method, for say, 10 iterations. While it is feasible to do with a calculator (slightly easier if ...
0
votes
1answer
34 views

How to convert decimal answers into trig simplifications (symbols)?

When I use the calculator to get the result of this integral I get a decimal number. However, in my calculus book, as shown on the picture, the answer was represented using some trig symbols! Is ...
1
vote
2answers
54 views

Software to calculate an integer sum?

There is a result I want to calculate, but I don't know if there is any software that can help me with this. Anyone knows what could I use to help me? Any answer is much appreciated The formula is ...
0
votes
1answer
62 views

Different results when multiplying matrices with a calculator

I'm having a big trouble when I have to multiply 2 matrices. I think I have a problem with my calculator (HP 50g) because I get a correct answer but not the one my professor has. For example, I have ...
0
votes
1answer
32 views

How to find $x$-intercept on TI-83/TI-84 calculator without having to set the bounds for each intercept?

Finding $y$-intercepts is very easy on a TI-83/TI-84 calculator. All you have to do is graph the function and use 2nd $\to$ ...
2
votes
2answers
4k views

How to find antilog with simple calculator?

I know how to find log to base $10$ using simple calculator: say if you want to find log of $12$ you can do as blow: Step 1: $13$ times $\sqrt{\star} \implies 1.00030338$; Step 2: subtract 1: ...
1
vote
1answer
28 views

Hexadecimal arithmetic on calculator (casio etc.)

When I do hexadecimal subtraction say, 2A-324 on a casio calculator or any calculator in general, i get the result as FFFFFD06 Why do i get so many F's ?? dosnt F stand for 15 in hex. In any general ...
0
votes
2answers
36 views

Help buying a calculator program [closed]

Is there an economical calculator program I can buy that will let me multiply and divide numbers in the hundreds of digits and show all of the digits?
6
votes
7answers
1k views

How calculators do trigonometry [duplicate]

I need to use a calculator to find trigonometric ratios like $\sin(41),\cos(32)$. How do calculators work for trigonometry? Also, as calculators are invented by the human mind can we do it mentally? ...
21
votes
7answers
2k views

“Why do I always get 1 when I keep hitting the square root button on my calculator?”

I asked myself this question when I was a young boy playing around with the calculator. Today, I think I know the answer, but I'm not sure whether I'd be able to explain it to a child or layman ...
1
vote
1answer
55 views

When would a graphing calculator make an error while plotting a function?

It is possible for a graphing utility/calculator to plot a function incorrectly... What are some possible errors that may occur? What will cause those errors?
0
votes
3answers
10k views

Calculator model with mod function?

I'm wondering does anyone know of a scientific calculator with a mod function? In C# this is shown as follows (just in case there are any other mods that a mathematical non-savant such as myself ...
3
votes
3answers
7k views

How do you plot $x = y^2 - 6$ on a graphing calculator?

I have a graphing calculator app (Graphing Calculator+) that only allows me to enter $x$ as a variable, but I need to graph $x = y^2 - 6$. I haven't used a graphing calculator in awhile. Is this ...
3
votes
1answer
81 views

Why Can my Phone Calculator do $e^{\pi\sqrt{-1}}$ but not $\sqrt{-1}$?

When I type in the identity $e^{\pi\sqrt{-1}}$ on my phone calculator (LG phone running Android), I get the correct result of $-1$ However, when I simply type $\sqrt{-1}$, it returns an error. Why ...
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votes
2answers
30 views

Simplifying an exponential expression.

maybe this is a stupid question but I have the following expression: $ 10^{-18}(e^{50,9702078⋅0,75}) = 10^{-18}(4⋅10^{16}) $ How would I go about simplifying the big exponent on the left to what's ...
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votes
2answers
99 views

what does sin button do? I have always wondered why calculators have this function [closed]

What is the sin button on a calculator used for? I have always wondered why and how you would use this function.
6
votes
3answers
385 views

Express “if true, then 1 else 0” in a formula suitable for Desmos calculator

In programming, often the value of True is also 1, and False is 0. This means that: (x>5)*4 will return 4 if x is greater than 5 (because ...
1
vote
1answer
43 views

Raising i to a large power on a Ti-83

When I input this on my graphing calculator I get the correct answer: i^4 1 However when I do this with larger numbers I get a weird answer ...
2
votes
1answer
76 views

TI-84 gives 100 for $\frac{d}{dx}\sqrt[3]{x}\,\big|_{x=0}$

My TI-84 Silver Edition is doing something strange. If $f(x)=\sqrt[3]{x}$, $\frac{d}{dx}\sqrt[3]{x}=\frac{1}{3\sqrt[3]{{x^2}}}$ At $x=0$, $\frac{d}{dx}f(0)$ is undefined. When I type ...
0
votes
1answer
34 views

How can I use the solve() function inside of itself?

I'm trying to use the solve function recursively on my TI-89 calculator. Minimal example to demonstrate the concept: ...
0
votes
2answers
36 views

How to find values of trigonometric functions, using identities and a calculator?

Recently I have been covering trig identities in maths. One part of this is for example is being able to calculate another angle whose sine is is $0.990$, given that $\sin 98^\circ = 0.990$. Obviously ...
0
votes
1answer
37 views

How to calculate distance formula in fx-991MS calculator?

For formula $X=\sqrt{(A-B)^2 + (C-D)^2}$, how do I store this formula and take the values for A,B,C,D to get the value for X quickly without wasting time to write again the whole thing.
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votes
1answer
73 views

Find the absolute and relative error for a calculator with incorrect rounding

A calculator is out of order. The calculator will round up every single number to the nearest integer if the value at the first decimal digit is 6 and above, or else it rounds down the number to be ...
2
votes
1answer
40 views

What does my TI-83 or other TI graphing calculators use to numerically approach certain integrals?

I assume that most graphics calculators try to solve things analytically (where possible within reasonable computing time and power). Otherwise do they use numerical approximations for definite ...
1
vote
1answer
73 views

Calculating number of subgroups of explicit order in Magma Calculator

I have a group, given by direct product of $A_4$ and $D_6$. The exercise is to find all p-Sylow subgroups of $A_4 \times D_6$ without the use of 3rd Sylow theorem. I am confident I can find the ...
0
votes
2answers
102 views

Looking for a function calculator

I am looking for a calculator which can calculate functions like $f(x) = x+2$ at $x=a$ etc; but I am unable to do so. Can you recommend any online calculator?
4
votes
4answers
4k views

Calculator similar to Desmos but for 3D

Is there a calculator with functionality similar to Desmos but in 3 dimensions? I am looking to learn about families of quadric surfaces so I am looking for a 3D calculator with sliders.
1
vote
1answer
866 views

Difference between squaring a negative number and multiplying 2 equal negative numbers?

I've seen some strange behavior on 3 different calculators. Whenever I enter -2^2, I get a -4, and when I enter -2 * -2 I get a positive 4. Why does squaring a negative and multiplying it by itself ...
0
votes
0answers
45 views

How to mathematically calculate this?

I want to know "energy price" to conduct panel data analysis. But I cannot find it on database of all web-sites. On all database, enegy price is unavailable. And according to my reseach, it's said ...