exam Maths Puzzle Numerical Ability

Explain how to multiply and divide rational expressions.

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exam Other Question

The sum of two numbers is 24, and one is twice the other. find the numbers. Write the function to show a collectable doll that has doubled in value in 10 years. The initial value of the doll was $355.00.
I think the answer is y=355(2)^x/10 . Am I correct