The rule is add 18 each time and the mistake is 55
<span>Every term in a sequence is denoted by a1 being the first one, a2 the second one, a3 the third one and so on. So in your case, a3 means, which one is the third term? So 100 would be your answer. </span>
Polynomial of degree 2 are those polynomials with highest power of two, from our choices, the polynomials of degree two are:
10x^2-x^(1/2)
6x^2-6x+5
The rest of the choices are polynomials of degree 3.
I got 42 so try that and see