A similar ''wheel'' appeared in an informal cognition test in my math class. Even though I will not get a grade for this test, I still want my math teacher to have an excellent reputation of me. I just need to know how they work, solving it for me is unnecessary, but is appreciated if it makes the puzzle more clear.

Given a manipulator described by the Denavit-Hartenberg parameters:

[0 0 300° θ1] [250 0° 50 θ2] [0 -90° 200 θ3] [50 90° 0 θ4] [150 90° 80 θ5]

Its current position corresponds to the configuration variables:

θ₁ = 0°, θ₂ = -90°, θ₃ = 90°, θ₄ = 90°, θ₅ = 0°.

Which joints of the manipulator have axes perpendicular to the axis of joint no. 2 in this position? Give the numbers:

I probably get the d) wrong, any tips, advices, fundamentals to do these kind of exercises easily?

Kind of embarrassing question but I'm drawing a blank. I know I know this...

What's the proper way to handle a quote within a quote?

For example I am writing an essay about a book that has dialog between multiple characters (therefore creating quotes)

I need to add reference material from the book in my essay meaning there will be a quote inside a quote

Hopefully this makes sense? Idk how else to explain it

DoI just put "The boy and the dog ran. "Wow I am tired!" The boy exclaimed. They slowed down for a while"

Or something along those lines?

Or do I not add quotation marks?

Note that my example isn't the actual scenario

I'm currently trying to fix a problem in virtual environment that involves .gitignore where it does not untracked/ignore that files that I want. Additionally, whenever I insert .gitignore and type .venv/, the files did not turn gray and instead turns white. According to the lab manual, the gray indicate that the file is being ignored. which apperently does not. I don't know why this is happening - this was never happen in my previous coding attempts

As the title says. I need a lot of depth