Answer: Maybe it's the third one I'm not completely sure. don't take my word for it.
Step-by-step explanation:
Sum of polynomials are always polynomials.
Note that despite it's name, single constants, monomials, binomials, trinomials, and expressions with more than three terms are all polynomials.
For example,
0, π sqrt(2)x, 4x+2, x^2+3x+4, x^2-x^2, x^5+x/ π -1
are all polynomials.
What makes an expression NOT a polynomial?
Expressions that contain non-integer or negative powers of variables, rational functions, infinite series.
For example,
sqrt(x+1), 1/x+4, 1+x+ x^2/2!+x^3/3!+x^4/4!+...., (5x+3)/(6x+7)
are NOT polynomials.
We can find the acceleration via
We have
Then by definition of average acceleration,
so that
We alternatively could have found the time without knowing the acceleration. Since acceleration is constant, the average velocity is
Then
It's 77.472 , but since you probably need too round it will be 77.5
