Is the second power of 7Y a monomial or a polynomial

Is the second power of 7Y a monomial or a polynomial

Because there is no plus or minus sign in the middle, 7 and Y squared are multiplied
So it's a monomial, and the number is two

It is known that the product of a polynomial and the monomial - 6xy is 24x & # 178; y-12xy & # 178; + 8xy. Please explain it in detail,

24x²y-12xy²+8xy
=-6xy(-4x+2y-8/6)
The polynomial is: (- 4x + 2y-8 / 6)

5x-3(20-2x)=7x-6(8-x)
2x-1 / 3-10x-1 / 6 = 2x + 1-1 / 4
1.5x-2 of 0.6 = 0.5

5x-3(20-2x)=7x-6(8-x)
x=-6
3 (2x-1) - 6 (10x-1) = 4 (2x + 1) - 1
x=7/18
1.5x-2 of 0.6 = 0.5
x=