20 Most Recent Texas Instruments TI 30XIIS Scientific Calculator Questions & Answers

A=P(1+i)^n, where P is the Principal, i is the interest rate per period, and n is the number of periods.

A=10,000(1+0.075)^3, assuming the interest is compounded annually

For 30 years, we would replace the number of period 3 with a 30.

Good luck,


Texas... | Answered on Jun 20, 2016

Suppose that astronomers estimate that large meteors (above a certain size) hit the earth on average once every 100 years (lamda = 1 event per 100 years), and that the number of meteor hits follows a Poisson distribution. What is the probability of k = 4 meteors hits in the next 100 years?
See solution of the problem below


Texas... | Answered on May 31, 2016

The Pi key is marked.

Texas... | Answered on Feb 11, 2016

I am not sure you can do it for the 5 figure summary.
Use the 1-var key, enter your data (using the frequency column for repeated data values). Then display x_bar, n, or other Q1, Median, Q3. Mode.

Texas... | Answered on Jan 30, 2016

No need to reset. Read the manual on how to enter data. If you have no manual, an electronic copy of it is available on the TI website.

Texas... | Answered on Nov 20, 2015


to explain what a logarithm is, it's to involved to explain here but check sosmath.com for a detailed explaination of it

i use it to find root and powers of numbers. it turn up in certain natural process like radioactive decay, population growth, interest calculations..etc

for square rooting a number

square root of 16
type 16 press the log ( I'm using a scientific calculator a TI 30s to be exact) key to get 1.204119983 for a result divide by 2 to get .602059991 press shift or 2nd log key ( to get the 10^ key - this the anti- log key) to get 4 as a result

I hope this helps

Texas... | Answered on Dec 12, 2014

To evaluate the expression you need the value of x.
To solve you do as follows
Take the exponential of both sides of ln(5x)=3
This gives x=(1/5) e^(3)

Texas... | Answered on Sep 02, 2014

It means your calculator is currently set to measure angles in degrees.

There are three common units to measure angles. A full circle is 360 degrees, or 400 grads, or two pi radians. The results of the trigonometric functions depend on the current measure, just as you'd get different numbers if you measure a person's height in inches, feet, or meters.

Texas... | Answered on Jul 15, 2014

It's the leftmost key on the third row, marked "LN."

Texas... | Answered on Jun 15, 2014

Use the (-) key just to the right of the decimal point key.

Texas... | Answered on Jun 15, 2014

The arccosine function is defined for arguments in the range from -1 to +1. 50/30 is greater than 1 and thus is out of the domain.

Texas... | Answered on Jun 13, 2014

Press 2nd SIN

For example, to calculate the inverse sine of 0.5, press 2nd SIN . 5 =

Texas... | Answered on Jun 13, 2014


Texas... | Answered on Jun 12, 2014

Correct. The 30Xa will not display commas.

Texas... | Answered on Jun 11, 2014

Press the DRG key to cycle through the three angle modes. Be aware that whatever mode you select, the corresponding indicator will appear on the screen.

The angle mode should not affect the exponential and logarithmic functions. If you still get errors, please post an example or two, including the exact keystroke sequences.

Texas... | Answered on Jun 11, 2014

The 30XIIS only calculates logs to base e (natural log, ln) and base 10 (common log, log). However logs to any base can be calculated indirectly.
To calculate log base b of x, calculate either log(x)/log(b) or ln(x)/ln(b).

Texas... | Answered on Jun 11, 2014

There isn't one. You can calculate e by raising e to the first power. Press 2nd [e^x] 1 ) =

Texas... | Answered on Jun 10, 2014

Leftmost column, fourth button from the top.

Texas... | Answered on May 03, 2014

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