can I save notes in this calculator??? Can i write and save formulars??

Here is the answer from Casio:There are two features on the fx-9750GII that you might find useful:(1) in Graph mode (Option 3 from the Main Menu), you can use GMEM to store and recall functions that you wish to graph repeatedly.(2) Program mode (Option 9 from the Main Menu) allows you to enter programs, which is very flexible and might allow you to store the notes and formulas you need. However, its primary purpose is to execute programs, so I don't know how useful that option would be for you. It depends on how much information you are planning on storing.There is no specific note-taking mode on the fx-9750GII.

which is the max size of matrix you can input?

According to the user manual, the max size of matrix you input is 999 (rows) X 999 (columns).

Where is the stat key? My son says he needs a graphing calculator for college algebra and it has to have the stat key

I don't use it for stat, but there's a menu button, and when you press it, it shows you the main menu. There you'll find Stat. There's another option in that menu for Graph! I use the graphing option all the time, it's very easy to use.

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📈 Elevate your study game with timeless tech that keeps you ahead!

BATTERY INCLUDED READY - Comes with a long-lasting 4.9 Wh lithium battery so you’re always powered up.
PLUG PLAY USB CONNECTION - Easily transfer data and connect to other devices without hassle.
LIGHTWEIGHT PORTABLE DESIGN - Compact 215g body fits perfectly in any backpack or desk setup.
ADVANCED GRAPHING CAPABILITIES - Visualize data effortlessly with circular and bar graphs on a crisp 21x8 line display.
CONSISTENT TECH YEAR AFTER YEAR - Empower students with reliable, unchanged technology for seamless learning progression.

The CASIO FX9750GII graphing calculator combines reliable, consistent technology with advanced statistical and graphical functions. Featuring a sharp 21x8 line display, USB connectivity, and a lightweight design powered by a 4.9 Wh lithium battery, it’s the perfect tool for students who demand performance and continuity year after year.

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Brand	CASIO(カシオ)
Manufacturer	カシオ
Product Dimensions	2.54 x 10.16 x 15.24 cm; 215 g
Batteries	1 A batteries required. (included)
Item model number	FX9750GII
Is Discontinued By Manufacturer	No
Color	Black
Item dimensions W x H	25 x 102 x 152 mm
Standing screen display size	2
RAM Size	0.26 MB
Wireless Type	Radio Frequency
Power Source	Battery Powered
Are Batteries Included	Yes
Lithium Battery Energy Content	4.9 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium Battery Weight	0.85 Grams
Nombre de cellules Lithium-Métal	1
Item Weight	215 g

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