How do I work this out?
You add the exponents so it would be 4+5 which is 9 so your answer is a^9
A=9. A4= 9x9x9x9=6,561. A5=9x9x9x9x9= 59,0496,561 X 59,049 = 387,420,489 The answer is 387,420,489