are these correct

Here is the questions it says to simplify: xyy^2 x^3 and here is the answer x^4 y^3
here is another one m^3 pmxm^2 x^3 p^5 and here is the answer m^6 p^6 x^4
and here is another one xm^2 xm^3 x^3 m and here is the answer x^5 m^6
and here is another one ky^2 k^3 k^2 y^5 and here is the answer k^6 y^7
and here is the last one a^2 ba^2 b^3 ab^4 and here is the answer a^5 b^8

all correct.

explain how to do this one thanks
x^2-3yx+2yx^2-2xy+yx it saids to simplify by adding like terms I Just don't get it :0)

Look at the three yx or xy terms...combine them into one.

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