Can somebody please help me with these questions?thank you sm

Number 5.)
A.)
First, we would want to make an equation. Aiden knows that each nickel is 3.2 grams. He also knows that his collection is 185.6 grams. Therefore, his collection can be represented by the following(x being equal to how many nickels he has)
3.2x=185.6
You can find out how many nickels he has by isolating the variable. In this case, you would simply divide each side by 3.2. Giving us:
x=58
Aiden has 58 nickels in his collection.
B)
This is built off number 5. A nickel is five cents. Aiden has 58 nickels. To find the total amount of change he has, we can make the following equation:
5(58)=y
Then simply
Aiden has 290 cents. Or 2 dollars and 90 cents.
I don’t know how to solve the rest. Sorry!

The 8th term is 512