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

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1answer
22 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 ...
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2answers
35 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?
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1answer
68 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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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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2answers
92 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.
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3answers
305 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 ...
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1answer
40 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 ...
6
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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? ...
0
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1answer
27 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: ...
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2answers
28 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 ...
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1answer
33 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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1answer
56 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 ...
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1answer
51 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 ...
2
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1answer
34 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 ...
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0answers
12 views

Systems of linear equations (limiting probability) in TI-84?

I changed the usual pi symbols to letters to make it easier to read. a= 1/4a + 1/4c + 1/4d b= 1/4a + 1/4b + 1/4c +1/4d c= 1/2a + 1/2b + 1/4c a + b + c + d = 1 Here are the answers. a= 3/16 ...
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0answers
44 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 ...
0
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3answers
57 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 ...
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3answers
550 views

Is there a way to use a calculator for logarithmic form equations that aren't base 10 or base e?

Is there a way to use a calculator for logarithmic form equations that aren't base 10 or base e? I just find this really hard to believe and quite unacceptable that the only way to do this is ...
2
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0answers
79 views

What is logarithm & how log table can be constructed by me?

I'm studying properties of logarithm but I don't understand how base e works. Base 10 looks simple while doing calculations of numbers having multiple of 10. As other numbers are not multiple of 10 ...
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1answer
51 views

How to use Beta Distribution

Like the title says how do I use this. Especially in a case where $P(X \le 0.5)$ and harder cases where there are 2 bounds like $P(0.25 \lt X \lt 0.5)$. I am using a TI-84 graphic calculator The ...
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1answer
222 views

Drawing a picture with equations

I have a school project where I have to create an image on my calculator by forming equations. I want to create the Apple logo and have been trying a lot but I can't come up with any equations. My ...
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3answers
146 views

Is there a way to calculate lg on a scientific calculator?

Taking introduction to algorithms for computer science this semester and wanted to know if there is a way to calculate lg on scientific calculator? Thank you.
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1answer
30 views

I have an error when calculating “areas under a graph”

Q: Some computer algebra systems have commands that will draw approximating rectangles and evaluate the sums of their areas, at least if Xi is a left or right endpoint (for instance in Maple use ...
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1answer
134 views

Calculating a sum which includes binomial coeffeicients

Some formula for calculating the probablity that the difference between the number $6$ and the average of accidentally selected $100$ points among $10000$ points which are distributed in the interval ...
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1answer
33 views

Why are there different methods to finding quartiles?

On different programs and types of technologies there are different algorithms used to find quartiles. Ti 83 Plus will spit out an answer different from Excel or minitab etc. Why are there so many ...
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3answers
52 views

Difference between $(-x)^{1/n}$ and $-x^{1/n}$?

I know these seems to be splitting hairs, but according to two different calculators, there's a real difference. For e.g, $(-8)^{1/3}$ computes to NaN, where $-8^{1/3}$ computes to $-2$. Though am ...
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2answers
106 views

An online calculator that can calculate a sum of binomial coefficients

Is there any online calculator that can calculate $$\dfrac{\sum_{k=570}^{770} \binom{6,700}{k}\binom{3,300}{1,000-k}}{\binom{10,000}{1,000}} $$ for me? There are a few binomial coefficient ...
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2answers
365 views

Trigonometric functions as fractions on TI-84 Plus.

I know that on the TI-84, you can use mode to change settings to fraction mode. However, when I used trigonometric functions to convert them into fractions, they gave me decimals still. Is there ...
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2answers
45 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?
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2answers
55 views

Can the difference between a number and a set of numbers be calculated as follows?

I have a number $X$ (lets say $45$) and I have five other numbers, lets say $(3, 4, ,5, 6, 7)$ I want to know the difference between my number and the other numbers like this: ...
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0answers
368 views

Differentiating using Calculator Trick with Definite Derivative

Differentiate $y=sec^2(x)$ Answer in Problem Set: $2x\cdot sec^2(x)\cdot tan^2(x)$ Answer in Wolfram Alpha: $2 \cdot tan(x) \cdot sec^2(x)$ We can always solve it manually, deriving and stuff; but ...
14
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7answers
2k views

Conflicting limit answers using calculator and wolfram alpha

I want to evaluate $\lim\limits_{x\to0} \dfrac{\tan(x) - \sin(x)}{(\sin(x))^3}$, Calculator says it's 0 when substituted with 0.0000000001. Wolfram Alpha says it's 1/2. The Problem Set says the ...
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3answers
25 views

Help with calculating division with remainders on normal calculators.

I want to calculate 254 797 / 56 and when I use a calculator I get: 45478.5178571 basically I want to turn that .5178571 into the remainder. Please help.
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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 ...
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0answers
57 views

How to use the BA II Plus financial calculator to solve for IRR and NPV?

I've calculated the answers manually but would like to learn how to do so on the financial calculator to save time on the test and minimize errors. How to do this? Problem: You have been offered a ...
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1answer
224 views

How do I make my TI-89 evaluate a recursive function?

On my TI-89 I can assign variables recursively such as: $1\to x$ returns 1 $x+1 \to x$ returns 2 $x+1 \to x$ returns 3 etc. How could I do functions the same way: $x \to f(x)$ returns Done $2\cdot ...
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2answers
92 views

How to find high power numbers modulo

How can I find high power number modulo number. What If I have to do it with the calculator or if the calculator is not allowed in exam. For example: $174^{55} \pmod {221} \equiv 47$
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4answers
2k views

How do pocket calculators calculate exponents?

I'd like to know specifically how a pocket calculator (TI calculators also apply) calculates $e^{0.1}$, and what methods or algorithms pocket calculators use in order to produce their answer.
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1answer
37 views

Calculation Issue (not a math problem, but I just need help with calculation)

For a) I just plugged in e to the equation and got the answer. I am stuck on the rest. So for b) I plugged in the CO2 they gave us into the e equation and then calculated e and plugged it into the ...
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1answer
40 views

Why do I get the Fibonacci sequence when I start with 1 and keep using the + sign?

I played with this on a calculator and when I entered 1 and kept hitting the + button, I got the noticeable Fibonacci sequence! Can someone explain to me why this happens?
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6answers
527 views

8 / 4 (4-2) = ? What is answer? [duplicate]

What is answer for 8 / 4 (4-2) = ? My answer is 4. But some says it's 1. And arguing each others. They even using some calculators for prove them. Even those calculators showing both 1 and 4 as ...
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1answer
207 views

Store a constant on a TI 84

On my TI 84 I have a variable E with the value 8.854e-12, ie. Epsilon not, which I use for my physics class. I also have G and M for 6.67384e-11 and 4pi e-7, both of which I have found I need for my ...
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1answer
452 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 ...
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5answers
11k views

how do you type sec^2(0) on a calculator?

I press cos^-1 then ^2 then brack (o) but then it comes up with syntax error
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1answer
230 views

Why does my calculator answer .1564 for cos(90)?

I know that cos(90) equals zero but my calculator gives .1564. Everything else but trig functions work properly on my calculator. It may be broken or I might have pressed a button the changes the ...
2
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1answer
66 views

Why does this always equal $1$?

One of my friends told me this. Take a calculator and continuously input $\cos\tan\sin\cos\tan\sin\ldots$ any number of times you want and finally in the place of the angle measure place any value of ...
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2answers
93 views

Is a graphing calculator a necessity when one studies a higher level of maths? [closed]

Is it required, and what are the main uses and advantages/disadvantages that come with them?
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3answers
242 views

Is $\tan^{-1}$ for $\arctan$ on my calculator wrong?

On my calculator $\tan^{-1}$ is used to calculate the $\arctan$, but $\tan^{-1}$ actually is $\cot$. $\cot$ and $\arctan$ are not the same thing though. Am I missing something or is the labeling of my ...
2
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1answer
2k 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: ...
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1answer
145 views

How do you calculate a test value that only effects your grade by a certain percentage?

My teacher has talked about how a certain test will only effect twenty percent of your final mark, how do you calculate this? Say my current total mark is 95%, I got a test score of 70%, but the test ...