Answer - 13.098 gm
Description -
Dear student,
As we know 
⇒ Mass = Density * Volume
so multiplying given Volume with the Density of gold ,we can calculate the mass of the gold . Density of gold at room temp. is 19.32 grams per cubic centimeter.
so mass of the sliver of gold = 19.32 * 0.678 = 13.098 (ans)
8,-2. place the x as 8 and y as -2.
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Hello!
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❖ You can write 0.8 as 8/10 and 80% as 80/100.
(8/10 and 8/100 are equivalent.)
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setup a simple algebraic equation and solve.
5x = 7x-28
-5x -5x
0=2x-28
+28 +28
28=2x
Now divide both sides by 2 and you get that she is 14
First solve it, then do the reverse operation to it
