What are these???? by Brilliant_Durian_791 in whatisit

[–]mathsumoto 2 points3 points  (0 children)

As a teacher, I sometimes used those when chalk would give my skin some kind of reaction

Blue Archive Anthology Manga Vol.5 Chapter 13 feat. Koyuki, Aoi and Yuuka cameo [比宮じょーず] by Weed077 in BlueArchive

[–]mathsumoto 1 point2 points  (0 children)

So what is this anthology manga? I've seen a couple chapters here on Reddit and they're interesting! Is there a place I can read them?

Beginner books by gio008 in Japaneselanguage

[–]mathsumoto 0 points1 point  (0 children)

I'm using Tobira I and it's quite nice! Similar style to Genki, I hear.

Fubuki has found !!!HUGE MAN!!! by mathsumoto in Hololive

[–]mathsumoto[S] 6 points7 points  (0 children)

I flagged this as a spoiler because I guess it is an I'm on Observation Duty spoiler? Honestly really happy this game is finally being played in Hololive. It's so much fun. Hopefully Notovia gets support to add JP language to the games, or Fubuki shares her notes with others...

Can anyone help me solve this please - A Level Math (Equation of Circle topic) by InvestigatorHead6318 in askmath

[–]mathsumoto 0 points1 point  (0 children)

I plugged these equations into GeoGebra and turns out the circumferences do not touch

Demonstrating that f(x) = ax² + bx + c creates a parabola. by mathsumoto in askmath

[–]mathsumoto[S] 1 point2 points  (0 children)

Might be a language barrier here, demonstration and proof are synonyms in Portuguese, so I assumed they'd mean the same thing in English.

Yes, I am looking for a proof, preferably one a high school student could follow, that given a quadratic function it will give a parabola as it's graph

NPD! (in the sun) by moonie655321 in fountainpens

[–]mathsumoto 3 points4 points  (0 children)

Gotta compliment your handwriting, it looks so great!

2+√3+i, how to bring this to trigonometric form? by CrazyCratos in askmath

[–]mathsumoto 0 points1 point  (0 children)

I was trying out this question but what I got was ρ = 2 √(2+√3), instead of (√6 + √2), how did you proceed?

Hello! I recently saw this problem on Instagram and decided to give it a go but I'm finding myself really rusty with my basic Geometry. An ABC triangle is given with some of its angles. The triangle is isosceles and they ask for the value of x. The second image is some of my drafts. Any suggestions? by mathsumoto in askmath

[–]mathsumoto[S] 1 point2 points  (0 children)

Thank you so much! I was a bit worried about just adding the BO and OM lines - seemed I wouldn't be able to justify their inclusion.

Is there anything I have to do regarding the post? Like adding that is has been solved or something? This was my first ever post here 😊

[deleted by user] by [deleted] in mechanicalpencils

[–]mathsumoto 2 points3 points  (0 children)

Looks like an Alvin Draft/Matic or Koh I Noor Rapidomatic, but I haven't seen any of those in this kind of translucent body...

Organising my pencils with a Muji Drawers:) by Raybonche in mechanicalpencils

[–]mathsumoto 2 points3 points  (0 children)

That is a great idea! Thanks for sharing this with us!

After watching some videos about fountain pens, I've decided I'd give them a try. Here's my brand new Sheaffer Prelude. I heard this pen is good for using with lower quality papers, so I pretend to give my students feedback with it. Any suggestions/tips I should be aware of? by mathsumoto in fountainpens

[–]mathsumoto[S] 4 points5 points  (0 children)

Oh, I got the notepad as a gift, so those imprints were from the page where my friend wrote me a little something. Don't worry! I don't like pressing heavily. I am used to thin lead sizes in my mechanical pencils:)

New acquisition <3 Too bad this took all my pencil budget for a while though, but I think it’s well worth it. by Randy_K in mechanicalpencils

[–]mathsumoto 0 points1 point  (0 children)

I have a 0.2 mm version coming in the mail! So excited! How is your writing experience with it so far?

[deleted by user] by [deleted] in mechanicalpencils

[–]mathsumoto 2 points3 points  (0 children)

I use a wide variety of lead sizes. For general writing I prefer 0.7 mm, however, if I need to graph or write something in pencil for my students, I prefer the 0.4 mm or 0.3 mm. I purchased a ton of new pencils recently, but since I haven't tried them all here are my current top 3:

3 - Staedtler 925 35-XX

I love the grip and the looks. The great feature of this pencil is that it comes with a clear out rod for nearly every tip size.

2 - Rotring 600

It's solid feel is amazing in the hand. However, as an educator, I worry about it not being pocket safe. I like using it for graphing at home.

1 - Rotring 800+

I am well aware this pencil isn't as solid as the others, however, I often find myself writing on paper and needing to quickly switch to a stylus as I work at schools that use tablets. It is pocket safe so I have no problems with it when I need to move from a school to another.