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Alpha Centauri is 4.3 light years from Earth. Express this distance in kilometers in scientific notation. (A light year is 9.5*10^12 km).
Maria bought seven boxes. A week later, half of all her boxes were destroyed in a fire. There are now only 22 boxes left. With how many did she start?
The difference of 2 numbers is 15. The smaller number is 3 more than half the larger number. Find both numbers?
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