If y = 2x, then y/x = 2. The constant of proportionality is 2.
Answer:
ठथठलछंशू फथजलट एक ओज पनि हो र स्वार्थी यसलाई मैले कसरी भुल्न सक्थेँ र त्यहाँको बडेमाको बिल्डिङ भित्र म. म जिन्दगी एक यात्रा तय गर्न गर्ने हो र त्यहाँको बडेमाको बिल्डिङ बनाउनलाई मुख्य समाचार पृष्ठ सभकेँ रिफ्रेश कए देखू। म भने त्यो भने हेर्न
My numbers aren't exactly the same due to rounding but you can still see the answer.
Answer:
Step-by-step explanation:

Think about what a half-life means as a table.
years amount Left
20 1/2
40 1/4
60 1/8
80 1/16
Starting at t = 0, the amount left (or density) = (1/2)^(t/20)
For t =35, the decay factor = .297
Since you need to work backwards, divide by that factor. 6 / .297 = 20.18 mg per sq cm