Physics, Math up to calculus, English, feel free to ask

What day was it when √-1 2^3 ∑ π?

I don't know, can you help me? By explaining and possibly answering your own question? If not, feel free to move on.

Clue: convert the mathematical symbols to homophones.

radical sign or square root sign - s or r
dash or negative sign - d or n
one - o
two - t
^ exponent - e
3 - t
sigma - s
pi - p

I am not getting a word. What kind of puzzle would this fall under?
I would like to study questions of this nature.

The collective noun is rebus, however I have added a lateral thinking puzzle.

What day was it when √-1 2^3 ∑ π?

√-1 ..... i
2^3 ..... 8
∑ ..... sum
π ..... pi

What day of the year was it?

Can you work it out or should I reveal the answer?

Lol ok now I get it.

I don't know, what day was it when you ate pi?

I didn't think there were any breaks.

OK.... Here is a question

There are five people in a room. Eight people leave. How many people need to reenter the room for it to be empty?

A biologist, a physicist and a mathematician were sitting in a street cafe watching the crowd. Across the street they saw a man and a woman entering a building. Ten minutes they reappeared together with a third person.​

- They have multiplied, said the biologist.​
- Oh no, an error in measurement, the physicist sighed.​
- If exactly one person enters the building now, it will be empty again, the mathematician concluded.​

I’m still here!!!

Lol

It was 37 days ago. What was the date?



A rectangular garden of 18 by 30 feet is surrounded by a path with a total area that is 3/5 the size of the garden. How wide is the path?