exam Maths Puzzle Numerical Ability

Write a formula that expresses the relationship described below
y varies directly as x and y = �10 when x = �7.

What are the key words that I should notice that helps me write formulas?....I know y = ?/?

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exam Other Question

All work needed to arrive at a correct answer. If it is not a question that requires work, you will need to provide a complete explanation of how you determined the correct answer. Calculate the range and the standard eviation for each set of numbers.

5,4,2,5,7,5,2,4,3,8,

The book does not give me clear directions can someone help me out.

Thanks