Question

a
$a {}^{5} \times a {}^{4}$
​

Answer 1

Step-by-step explanation:

${a}^{5} \times {a}^{4} = {a}^{5 + 4} \\ = {a}^{9} \\ the \: formula \: used \: here \: is \\ {a}^{m} \times {a}^{n} = {a}^{m + n}$