The half-life of palladium-100 is 4 days. after 16 days a sample of palladium-100 has been reduced to a mass of 3 mg.

what was the initial mass (in mg) of the sample?

what is the mass 8 weeks after the start?

1. 48 mg.

2. 12 mg.

Step-by-step explanation:

We have been given that the half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced to a mass of 3 mg.

Half-life formula: , where,

A = Final amount,

a = Initial amount,

t = Time,

h = Half-life.

Substitute the given values:

Therefore, the initial mass of the sample was 48 mg.

To find the mass of sample after 8 weeks, we will substitute in half life formula.

Therefore, the mass of sample after 8 weeks would be 12 mg.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm