Oh my God I’m doing the same thing in school not the same question but it is so hard I wish I could help you but I’m confused on that subject to
Go ask your professor for advice it is much better for any normal person
For this case, we must find an expression equivalent to:

By definition of power properties we have:

Rewriting the previous expression we have:
The "-" are canceled and we take into account that:

So:

According to one of the properties of powers of the same base, we must put the same base and add the exponents:

Answer:

Option B
Answer: 28
Step-by-step explanation: you have to add 21 + 7 because your counting up from -7 to 21
I think it’s 51.6% because 8.3% interest at the rate of 6 years is just 8.3 multiplied by 6 which is 51.6