Answer:
is there any choice? in this question?
Answer:
it's C and D... do you understand?
Answer:
magnesium (Mg), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table, and the lightest structural metal. Its compounds are widely used in construction and medicine, and magnesium is one of the elements essential to all cellular life.
Explanation:
hope it helps
One Astronomical Unit is the distance between the Earth and the Sun, this acts as a sort of a cosmic metre stick. Astronomers don't and cannot measure distances. Distances are merely inferred from what actually has been measured, such as an angle, a relative luminosity, a time period
Answer:
So we have a measure in grams, we can start with something like:
143.523 grams.
Now we want this measurement to be precise to the nearest tenth of a gram.
The nearest tenth of a gram is the first digit after the decimal point, then the digits that come after this are not useful, because they are outside our precision range.
Then we must write our measurement as:
143.5 grams
Where the digit that came after the 5 was a 2, so we rounded down.
