If "+1" represents an increase of $1 in the price of each bottle of cooking oil, express the following price changes in positive or negative numbers.
(a) An increase of $5
(b) A decrease of $7
(c) An increase of $10
(d) A decrease of $8
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If "-1m" represents walking 1m to the South, express the following in positive or negative numbers.
(a) walking 3km to the South
(b) walking 5km to the North
(c) walking 10km to the South
(d) walking 8km to the North
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Express the following water temperatures in positive or negative numbers.(The freezing point of water is 0"c)
(a) 45"c above the freezing point
(b) 43"c below the freezing point
(c) 73"c below the freezing point
(d) 20"c above the freezing point
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It is given that the school term will begin on 2nd September this year.If "-1 day" represents a day before the school term begins, i.e. 1st September, express the following dates in positive or negative numbers.
(a) 4th September
(b) 30th August
(c) 11th September
(d) 22nd August
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岩岩升中一,有D唔係好明...記得用中文解釋番,麻煩晒^^