Seriously. It’s about time we started talking math on an ongoing basis. This seems as good a place as any to open the floor.

What’s the ol’ saying… if it walks like a cube, and quacks like a cube, it’s a duck.

## It's a plot of

`y = x ^ 3`

No, it’s a “squiggle”

`r ^ 2 = (x - h) ^ 2 + (y - k) ^ 2`

where `(h,k)`

is the centre point of your circle and `r`

it’s radius.

`g = c`

where `g`

is the graph and `c`

is a circle

Given all our recent concerns, PI day flew right past us.

It’ll come back around

What will the curve tendency be in this…

```
>>> two_day_change = [23, 39, 56, 74]
>>> x = two_day_change
>>> [b / a for (a, b) in zip(x[:-1], x[1:])]
[1.6956521739130435, 1.435897435897436, 1.3214285714285714]
>>>
```

???

What does this mean?

It’s a little mathematical aside.

oh ok ty for telling!

I agree; looks like the cube function … y = x^3

What’s the code to make that graph in Matplotlib in Python?

Ok, so the sequence started `x = [23, 39, 56, 74]`

which is a **quadratic sequence** since the differences between the terms increase by a constant amount …

x = [23, 39, 56, 74]

print( [ x[i] - x[i - 1] for i in range(1,4) ] )## [16, 17, 18]

I assume that curve tendency means the **limit** of this sequence ( meaning what we’d go to if we could go to an index of *infinity* )

`b/a`

was the ratio of a term to the previous term of the sequence

So …

this ratio goes to 1 as we’d go infinitely far out in the sequence.

Using quadratic regression …

`x[n] = 0.5*n**2 + 15.5*n + 23`

Full disclosure: I used to be a math teacher.