Iridium-192 is one radioisotope used in brachytherapy in, Ask an Expert

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Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient\'s body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium-192 is often used in the head or breast. Answer the following three questions (a, b, and c) based on the radioactive decay curve of iridium-192, shown below. Theres a graph, but i dont know how to use it

a) If the initial sample is 1.75 g, what mass of the original iridium-192 remains after 5 days?

b) Estimate the half-life of the radioisotope.

c) How many days would it take for one-fourth of the sample to decay?

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