3................................
Answer:
I believe it would be A
Step-by-step explanation:
A deck of cards has 52 cards in it, so it cant be C or D, and with all the possibilities it could not be B
Ok. This is called a Coordinate Plane (aka line plots). Your teacher is asking to find the number on those plots.
You have your X and Y axis.
You go over to X before going to Y
So I work my way up so your first one is
1,2
Second is
-2,4
Third is
2,6
and the last one (the top plot)
1,8
Hope this helped!
Brainiest please!
Part A:
The amount of substance left of a radioactive substance with a half life

and amount of initial substance

is given by

Given that th<span>e
isotope samarium-151 has a half-life of
around 96.6 years and the rock contains 5 grams of samarium-151 when it
reaches its closure temperature, and it contains 0.625 grams when it is
discovered.
</span><span>The time since the rock reached its closure temperature is obtained as follows:

Therefore, </span>t<span>he time since the rock reached its closure temperature is 289.8 years.
Part B:
Given that the </span><span>rock
contains 5 grams of samarium-151 when it reaches its closure
temperature, and it contains 0.625 grams when it is discovered. The number of grams of europium-151 when the rock was discovered is 5 - 0.625 = 4.375</span>
0.17/0.2975 = 4/7 = 0.5714285714