Confusing Looking but Easy Question

[AmitSharma-fjno]

I didn't even get the question at the start but you made it so easy

[azizautop]

The second green f on the left made me think it was f(f(0.4)), sad there's no challenge

[jmaxim]

Mr H never turns his back to the camera/class. 👍

[Mori_mee]

He makes math so simple and im loving it

[Gbhmagic]

wee lol i knew this one😂 . Its so hard to maintain these abilities in math when you only use very specific calculations

[Vietnamkid]

You can plug 1.4 into (x-1) even if it isn't a function?

[abiymamo]

if 2a:3b=5:6 and 3b:2c=36:15 then what is a:c 🙏🙏🙏 do it

[jimjenke]

Sometimes it all depends on the definition of "is". (channeling my Bill Clinton)