TI-89 Titanium won't let me input anything or just freezes
My calculator has been for awhile doing thing. An example of what happens is that when I am on the home screen typing in anything, it will be entered in as a "t" symbol and when I press 2nd its a "tan(". It happens pretty randomly and it also just freezes the calculator when its doing nothing. any help to provide?
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The "problem" is not how to calculate with numbers expressed in Scientific Notation but how to enter a number given to you in scientific notation. Once the number is entered you do not have to do anything special. If you have to multiply it use the (x) button. to add it use the + button, etc.
How to enter a number in scientific notation.
Type in the mantissa (example 6.022) Press the [X10^x] at the bottom of keypad. Enter the exponent (example 23) with this example you will have entered Avogadro's number 6.022x10^23 Other example 1.6 [X10^x] (-) 19 enters the electron charge in Coulombs. The exponent is negative that is why you press the change sign key (-).
Decimal to fraction:
Type in your decimal (i.e. .5)
Then press [MATH] > press [ENTER] on [>FRAC]
Then press [ENTER] again
For a fraction to decimal:
Simply type in the fraction and press [ENTER]
(*Note that the decimal value is truncated to fit the screen)
Hope that helps! Have fun calculating!
If I understand your question correctly, this is what you can do. Go to 'Y='. Put (for example) 3x^2+4x+5 in Y1. Press '2nd', 'Quit' to go back to the home screen. Press 'Vars', arrow right to 'Y-Vars', 'Enter' on 1:Function, and 'Enter' on Y1. This should put Y1 on the home screen. After Y1 type a parenthesis, the number you want to evaluate, and another parenthesis, like this: Y1(7). Press 'Enter'. You should get 180.
Sorry, but it takes sometime to be well familiar with the calculator. The E in the result is a short-hand notation for times 10 to a power. What you got is 4x10^(0) which is just 4. Your calculator is doing that because it is configured to display result in SCIENTIFIC format. To revert to the format you may be more accustomed to,
Press the [MODE] key
The first line of the displayed screen will show NORMAL SCI ENG and the cursor blinking on SCI or ENG.
Use the left arrow to highlight NORMAL and press ENTER.
Press [2nd][MODE] to (QUIT) and go to main calculator screen.