Answer:
Trinomial.
Step-by-step explanation:
Note how much terms there are in the given expressions:
Term 1: 
Term 2: 
Term 3: 
Note each meaning of the terms:
Monomial: Having only one term.
Binomial: Having two terms.
Trinomial: Having three terms.
Polynomial: Typically used to describe expressions with 4 or more terms.
In this case, there are only 3 terms, and so your answer is Trinomial.
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Answer:
This can't really be factored, but it can be expanded slightly.
(3x³)³ = 27x⁹
0.05 ---> 1/18
square root of 0.25 ------> 0.05
1/7------> 0.142857 repeating
0.6 -------> 2/3
The answer to your problem is 50b+8
Z=kx, 30=8k, so k=30/8=15/4 and z=15x/4, so when x=4, z=15.