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MATH''問題

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1. Use scientific notation to represent 700 000 000. 2. A hawker has bought a lot of pears at $x. If he sells all the pears, he will get $y and make a profit of $400. Form an equation relating x and y. Equation:

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1. Use scientific notation to represent 700 000 000. Ans: 700000000=7x10^8 2. A hawker has bought a lot of pears at $x. If he sells all the pears,he will get $y and make a profit of $400. Form an equation relating xand y. y=x+400

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