Can you me with (algebra 1) the bottom part.

Simplify 1/3: 
    -  ((15x × (y2)) × ((1/3 × x^2) × z^3)) × y3z4 
    -  ((15x × (y2)) × (x^2/3 × z^3)) × y3z4 
    -  ((15x × (y2)) × x^2 z^3/3) × y3z4 
    -  ((3 × 5xy^2) × x^2 z^3/3) × y3z4
Multiply the exponential expressions and cancel out the three in x^3 on both sides of the equation.
    -  5x^3 y^2 z^3 × y^3 z^4
Multiply the exponential expressions again.

Your final answer should be  5x^3 y^5 z^7
I hope this helps!

4should be the last one n=4