(N instead of X for variable)
N x 7 < 21
Well you can use the Pythagorean Theorem Formula a

+b

=c

. Just plug in the first 2 least numbers into a and b, and see if your answer(c) is equal to the last number. Hope I helped!
The Distributive Law says that multiplying a number by a group of numbers added together is the same as doing each multiplication separately. Example: 3 × (2 + 4) = 3×2 + 3×4. So the "3" can be "distributed" across the "2+4" into 3 times 2 and 3 times 4.
I believe the answer is c. please let me know if its right or wrong.
Based on the given roots and their multiplicities, the function is made of the following factors:
f(x) = x (x + 3)^2 (x - 1) (x - 3)^2
The roots represent the point in the graph where they touch the x-axis. With the given condition that the function has a positive leading coefficient and is of even degree, the group of the function touches the x-axis at the roots and is curved upwards.