exam Maths Puzzle Numerical Ability

I am not to sure about this would some help me translate this to algebraic expression. use the letter d to represent some number and a decimal for the percent.
Here it is: The product of 43% and some number. Thanks so much for your help.

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exam Other Question

When a number line is used to add signed numbers, why is the endpoint of the first arrow at zero? How do I go about simplyfing this?

y^3(10x^2 + 3y-1)(5x^3 - 3xy - y)