Answer:
Step-by-step explanation:
b + t = 15, 2b + 3t = 45
If you need it solve:
2(b + t) = 2(15)
2b + 2t = 30 Now subtract this from the second equation
2b + 3t = 45
- 2b + 2t = 30
t = 15
There are 15 trycicles and 0 bycicles
Answer:
a) Two half lives, b) 
Step-by-step explanation:
a) The polonium-210 has a half life of 138.4 days. Therefore, 1.994 half lives have past.
b) Mass decay is described by the following exponential model:

The time constant for the isotope is:


The mass of the isotope after 276 days is:


Answer:
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