The half-life of Palladium-100 is 4 days. After 20 days a sample of Palladium-100 has been reduced to amass of 4 mg. What was the initial mass (in mg) of the sample?

What is the mass 4 weeks after the start?

answer: 800

step-by-step explanation:

what are the answer chices

the figure is a concave pentagon.

step-by-step explanation:

in mathematical context, a pentagon is a flat, two-dimensional closed shape (polygon) with 5 straight sides and 5 angles.

now a pentagon is said to be concave if one or more corners bend inwards and at least one of its angles is 180 degrees or more than 180 degrees.

in the given figure, we can see that we have a corner which is bending inwards and an angle which is clearly greater than 180°. therefore, it is a concave pentagon.

10 x 12 = 120 the tens to conte like 10,20,30,40 so i did that 12 times