Again you are the best tutor I have met to teach me how to use the calculator. You explain so simply an interesting that makes you think and use your brain easily. Thank you, bro... you are the best. ❤

Yep. You're right. It IS the best calculator under $20 you can buy, and it's incredibly easy to use. I tutor math and physics for high school and university students and have given away about twenty of these calcularos over the last few years. This calculator caused me to shelve my HP calculator because it's far easier to use. Good job on your tutorial video.

@blackpenredpen

7 жыл бұрын

Thank you for watching Fred. = )

Excellent tutorial! You are an outstanding instructor. Thanks to you I am thinking 🤔 about getting a T-shirt that says “Love my Casio fix-115ES”🤓

Great teaching videos!!!! I have dyscalculia and your videos have really helped me!! THANK YOU!!!!!

@blackpenredpen

6 жыл бұрын

I am glad to help : )

Amazing presentation / video, thank u very much sir

Excellent explanation! Thank you so much! 🤓

It's very helpful. Thank you for posting :)

thanks for your help you are really smart, very helpful video.

your videos are great. thank you

@blackpenredpen

7 жыл бұрын

Thank you

master of the double pen maneuver

Thank you.

thanks. good calculator.

how you do standard Deviation using Casio fx-115 ES PLUS

You showed us the vertex but, how did you know that was it?

@spaghettiking653

6 жыл бұрын

That is the "line" of symmetry, which the equation is symmetrical over: -2.5, -4, *-4*, -4, -2.5 ^^ vertex Notice how it is in the middle of two pairs of equal points (-2.5, -4 on both sides)

You gave me bunch of A and B

Do you really need a calculator to work this equation out?

Its the same with the slope of the line.

Its an upside down pattern (as i name it).

Or gradient

Ww

We say its linear.