Explanation:
it mostly referes to laziness
Can you please take a picture of the options?
Considering the definition of percentage by mass, the sample of pure lithium nitrate contains 7.99% lithium by mass.
<h3>Definition of percentage by mass</h3>
The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

<h3>This case</h3>
Because percent by mass indicates the ratio of solute to solution based on mass, if the sample has twice the mass of the first sample, the ratio remains constant.
So the percentage by mass is the same.
That is, the sample of pure lithium nitrate contains 7.99% lithium by mass.
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Learn more about percent by mass:
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If your driver license is suspended for too many points, we need to show a <u>proof of liability </u><u>insurance</u>.
What do you mean by insurance?
<u>Managing your risk is possible with </u><u>insurance</u><u>. The protection against unforeseen financial losses you </u><u>purchase</u><u> when you </u><u>purchase</u><u> </u><u>insurance</u>. If something bad happens to you, the insurance company pays you or a person of your choice. If you don't have insurance and an accident occurs, you can be liable for all expenses.
<u>An </u><u>insurance</u><u> policy is a binding agreement between the insurance provider (the insurer) and the individual(s), firm, or other entity being </u><u>insured</u><u> (the </u><u>insured</u><u>)</u>. Reading your policy enables you to make sure that it addresses your needs and that you are aware of both your own and the insurance provider's obligations in the event of a loss.
To learn more about an insurance, use the link given
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Answer:
4pi/3
Explanation:
XY = YZ = XZ = 2
angle YXZ is pi/3
wxy is 2pi/3
Area of the circle = pi*r^2 = 4pi
Area of the shaded area = 4pi * (2pi/3)/(2pi) = 4pi/3