Answer:
7a
Step-by-step explanation:
your multiplying a 7 times so this is how you right it
[tex] \qquad \qquad \large\overbrace{ \underbrace{\underline{ \boxed{ \sf \:Answer \: }}}}[/tex]
[tex]\green{ \qquad{ \sf{ \dashrightarrow{}}}} \sf a \: • \: a \: • \: a \: • \: a \: • \: a \: • \: a \: • \: a[/tex]
[tex]\green{ \qquad{ \sf{ \dashrightarrow{}}}} \sf a {}^{7} [/tex]