Let y be the unknown number
The other number is x - 12
Plane, think of planes as a rectangular shape. Rays and lines are just arrows. And a point is just one single dot
<span>You would have to wait 318 years for 1/5 (20%) of the Radium to disappear. 1590 is the point where half of the Radium would decay, so if you take 20% of that, it would equate out to 318 years. Radium has a long half life!</span>
4 / (5/6)
4 x (6/5) - flip the fraction and flip the second number
4 x (6/5) = 4.8
4.8 is your answer
hope this helps
