In this expression the highest degree of polynomials = 6 due to because see in the one of terms constains the power of x to be as 4 and y to be as 2 Therefore the highest degree of polynomials in all terms is 4+2 = 6
when dina arrived to 20 masha was at 16. so the relation is 20/16 and if dina's speed was 10 your formula is 10/x=20/16 that means x/10=16/20. so x will be 8
