exam Maths Puzzle Numerical Ability

When a number line is used to add signed numbers, why is the endpoint of the first arrow at zero?

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exam Other Question

In direct variation, is it possible for one variable to get bigger as the other variable decreases? 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.