Jawaban:[tex] {y}^{21} [/tex]Penjelasan dengan langkah-langkah:[tex] {y}^{10} \times {y}^{11} = {y}^{10 + 11} \\ = {y}^{21} [/tex]sifat eksponen:[tex] {a}^{b} \times {x}^{y} = {ax}^{b + y} \\ {a}^{b} \div {x}^{y} = {a \div x}^{b - y} [/tex]maaf kalo salah