Answer:
constant speed or a horizontal line is an rest
Explanation:
Answer:
1.)
2.) 
3.) 2HCl
4.) MgO
5.) Mg and 
6.) 
and
7.)Na and 
8.) 3 aluminums and 3 chlorides
Explanation:
Answer: - 0.75
Explanation:
For this question, you must remember that a fraction can be written of division.
So, -3/4 = -0.75, between -0.7 and -0.8 on the number line.
Answer:
Because the interstellar medium is 97% hydrogen and 3% helium, with trace amounts of dust, etc., a star primarily burns hydrogen during its lifetime. A medium-size star will live in the hydrogen phase, called the main sequence phase, for about 50 million years. Once hydrogen fuel is gone, the star has entered “old age.”
Iron, or Fe, is the only element here. The rest are alloys. I hope this helps!
