Which of the following are polynomial functions?

Options C, D and E

Step-by-step explanation:

A polinomial function that only involves non-negative integer powers of the variable. so they have the form

a*x^n + g*x^1 * h

where a, g, h are constants.

In the first option, you can see that you have a 2/x term, so this has a negative power of x, then this is not a plynomial function.

The second option has a square root, that is defined as a x^(1/2) which is not an integer power, so this option can be discarded.

The other 3 options are polynomial functions.

a28=58

step-by-step explanation:

a1=a1+(n-1)d

a28= 4+ (28-1)2

a28=4+(27)(2)

a28=4+54

a28=58