Answer:

Step-by-step explanation:

You have to prime factorise 81 and then you will get <u>9</u> as the answer.
Answer:
3 to the power of 4 and 2 squared
Step-by-step explanation:
count the amount of numbers and put the little number in top right (exponent)
You can buy 8 posters with 48.00 19.20x2=38.40 the leftover change isn’t enough to buy more