Me, i need understand so i can do my own! worth 20

A)  5x⁴-8  < the tell-tale guy is the exponent of the variable, is 4, so the                                     degree is 4, 5x then minus then 8, two terms, a BInomial

b) 4a²-2a-16   < same tell-tale guy, a² has a higher exponent than say                                            "a", so, the degree is the higher exponent, degree of 2
                           it has 3 terms, thus is a TRInomial
c) 9m³  < well, is the only term, variable exponent is 3, so, degree of 3
                   only one term means is a MONOmial.