Which expressions are polynomials? select each answer. a) -x^2+5x b)-7x^2+5/3x c) x^2+5x^1/5 d)6x^2+5x

The answer are (a) -x² + 5x and (d) 6x² + 5x.

Step-by-step explanation: We are given four different expressions out of which we are to select those which are polynomials.

We know that a polynomial is a combination of an unknown variable and its non-negative powers with real coefficients. For example,

is a third degree polynomial with constant coefficients a, b, c and d.

Since a polynomial does not involve negative poers of the unknown variable, so the options (b) and (c) are not correct.

Thus, the correct options are (a) and (d).

one of each metals

step-by-step explanation:

it would rotate about 180 degrees.