36 billion in scientific notation______ .

36 billion in scientific notation______ .


36 billion = 36 000 = 3.6 × 1010



258000 is expressed as ()


58 * (the 5th power of 10)



In scientific notation: 12.5 mg=______ Tons


5 mg = 12.5 △ 1000000000 = 1.25 × 10-8 tons, so the answer is 1.25 × 10-8