plzzzzzzz helpp mee!!! its math and

i really need hellpp!!!!!

How many significant digits are in 3.670 × 10^35
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Round 4279852.243 to 3 significant digits

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Round 0.0573000 to 1 significant digit

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Y = 45.2 + 16.730, Find Y

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Y = 23 – 26.2, Find Y

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