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Sagot :
1) This sentence is wrong because 30 minutes is half an hour, and is therefore 0.5 of an hour.
2) I don't quite know how to explain it, but D is the answer.
3) (Sorry, I can't really help you here. My knowledge on "order of magnitude" is shamefully limited.)
4) Well, we need to convert one of them to the other's unit first. Let's go with cm (centimeters). This would mean 2,5 * 100 = 250. We have 250 and 130 of the same unit, so we multiply to get the area, which is 32500 cm^2. But, this isn't our answer. Now, we have to find the square root of this number to get the side length of a square with the same area. And the square root is: ~180,28. So, the side length of the square is 180,28 cm.
2) I don't quite know how to explain it, but D is the answer.
3) (Sorry, I can't really help you here. My knowledge on "order of magnitude" is shamefully limited.)
4) Well, we need to convert one of them to the other's unit first. Let's go with cm (centimeters). This would mean 2,5 * 100 = 250. We have 250 and 130 of the same unit, so we multiply to get the area, which is 32500 cm^2. But, this isn't our answer. Now, we have to find the square root of this number to get the side length of a square with the same area. And the square root is: ~180,28. So, the side length of the square is 180,28 cm.
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