Looking at the purple area, we see that 1≤y≤3. So we can immediately reject answers (d), (a).
Since the purple area is to the right of and above the sloping line, we choose answer (c).
The correct answer to the whole problem is (c).
After 3 half-lives, the remaining amouunt will reduced by a factor of (2*2*2) or 8.
So 150 grams after 3 half-lives will be reduced to 150 / 8 = 18.75 grams.
40) -31
41 ) 19
this are the answers I think
It's not B. It's C. The product of two irrational numbers is irrational. When you multiply 2 irrational numbers, you most likely will get an irrational answer, but sometimes, you get a rational number, meaning it's false.