B. Fluorine (F) is the right answer
I think a shovel is a wedge simple machine.
The correct answer is that last one
Answer:
change of color
Explanation:
when a substance undergoes a change of color it is an indication that it was chemical
<span>Halflife is the time needed for a radioactive molecule to decay half of its current mass. If t is the time elapsed, the formula for the halflife would be:
final mass= original mass * </span>

<span>
If you put the information of the problem into the formula, the equation will be:
</span>final mass= original mass *

final mass= 800g *