-6 and -6 multiply to get 36 but add to get -12.
Hope this helps!
<span>-3x - 8y = 10
-3*2 - 8y = 10
-6 - 8y = 10
8y = -6 - 10
8y = -16
y = -16/8
y = -2</span>
Therefore, the bones were 6612.5 years old at the time they were discovered.
<h3><u>Half life</u></h3>
Given that the radioactive element carbon-14 has a half-life of 5750 years, and a scientist determined that the bones from a mastodon had lost 57.5% of their carbon-14, to determine how old were the bones at the time they were discovered, the following calculation must be made:
- 50 = 5750
- 100 = 11500
- 57.5 = X
- 57.5 x 11500 / 100 = X
- 6612.5 = X
Therefore, the bones were 6612.5 years old at the time they were discovered.
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