Start by putting two coins on each side of the scale. If one side is higher, then the light coin must be in that pair (use a second weighing to determine which of that pair is the lightest.)
If the initial weighing shows the two pairs to be even, discard those four and go to the three others. Put two of the coins on the scale - one on each side. If one side stays higher, that coin is your light one. If however they are equal, the final unweighed coin must be the lighter coin.
Answer:
18
Step-by-step explanation:
(-2)+(5 + 5)2
(-2)+(10)2
(-2)+20
-2+20=18
In order to add or subtract fractions, they must have the
same denominator. You need to change both of these
fractions to have the same denominator ... without changing
their values, of course.
The smallest common denominator for these fractions is 20 .
3/4 is the same amount as 15/20 .
3/5 is the same amount as 12/20 .
Now that they have the same denominator, you can do
the subtraction.
Use the property of logs: a ln b = ln (b^a)
Also e and log are inverses, so the cancel each other
42 times 2 because 84 divided by 24 equals 2. Also, 84 divided by 2 equals 24.
