Answer:
f(x)=3x5 is both monomial function, power function
Step-by-step explanation:
Monomial function is one which has only one term that is non-zero term.
example
b is a monomial with one variable
5xy^2 is a monomial with two variable
10x^10 is a monomial with one variable.
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power function is one which consist of a coefficient, a variable and that variable is raised to some non-zero power.
example
2x^6
area of circle = 
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given function
f(x)=3x5
1. it has only one non zero term thus qualifies to be called monomial
2. It has a coefficient 5, a variable x and that x is raised to some non-zero power 5. Thus, it is a power function as well.