For this case we have the following polynomial:

We observe that we have a polynomial of two varibles.
Variables: a and b
The degree of the polynomial is given by the highest sum of the exponents of the variables.
We have then for the following term:

The sum of the exponents is:

Therefore, the polynomial is of degree 6.
Answer:
the polynomial is of degree 6.
31-15=16 $ costs the boxes of danish
16:4=4$ -the price of each box of danish
For positive values of x it starts at the origin (0,0) because sin 0 = 0