exam Maths Puzzle Numerical Ability

Give some real life examples of objects or machines that produce similar figures.

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I have a problem that I can't seem to complete. The problem is do the operations and simplify: a^-3b^4 over x^-8y times a^8b^3 over x^8y^5
Can someone help me on this?
Thanks John Roberts has $42,180.53 in a brokerage account, and he plans to contribute an additional $5,000 to the account at the end of every year. The brokerage account has an expected a