book Maths Puzzle Numerical Ability

does a negative number x a negative number equal a positive number?

ex: -4x-4=

If so, can you explain the formula? Thank you

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book Other Question

A roast was cooked at 325 °F in the oven for 4 hours. The internal temperature rose from 32 °F to 145 °F. What was the average rise in temperature per hour? If you divide a iron rod that is 10m long into three equal pieces, what will be the length of each pieces? And if it wheighs 10kg and is equally divided into three pieces, what will be the weight of each piece?