book Maths Puzzle Numerical Ability

(-7)x(+3)= the answers are...-4,-12,-10,or 4 thank you!!!!!!!!!!!!!!!!!!!!!!!!!!

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can someone please help me out as soon as possible with this problem: translate "the difference between twelve times a number and the number" into a mathematical expression. tha a pile contains 1200 coins. Each day penny nichols takes 20% of the coins from the pile. Approximately how many coins remain in the pile after 7 days?

thank you sooo much!!