First of all, let's study each function:
Function A) 
This is a
quadratic function. This type of function is a second-degree polynomial function.
Function B) 
<span>
</span>
This is an
exponential function. This type of function is a non-algebraic function. It's also called <span>transcendental function.
</span>
Function C)<span>

</span>
It's a
straight line with slope equal to 100 and without y-intercept.
Function D)
<span>
It's a
cubic function. It's a third</span>-degree polynomial function.
So from the figure it is obvious that
the function that grows at the fastest rate is the exponential function B). In fact, an exponential function always grows more quickly than a polynomial function.
Answer:
Second, third and last are correct
5 would have to be the constant, because in algebraic terms, a constant is a term that contains only numbers and no variables, which would knock 2x right out of the question. Hope I helped.
Answer:
She can buy 7 Journals
Step-by-step explanation:
9 + 3x ≤ 30
Subtract 9 on both sides...
3x ≤ 21
Divide by 3 on both sides...
x ≤ 7
Hope this helps :)