The graph of a proportional relationship passes through the origin, and as a constant slope
The given parameter is:
- Proportionality constant (k) = 10/7
<h3>Condition for a proportional relationship</h3>
For a proportional relationship, the equation of the graph is represented as:

Substitute 10/7 for k

See attachment for the graph of the proportional relationship
Read more about proportional relationships at:
brainly.com/question/12242745
Answer: 30
Step-by-step explanation:
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:


If you multiply 25×6×4 you should get 600.
hope this helps!