These ones please, I have to retake my test tomorrow and I need help

(I) the half life is 10, what you will do is you choose a number that is divisible by two in the y-axis and then divide it, after dividing it, you trace it to the curve(time axis).. Let's choose 40 and divide by two that's 20 when we trace 20 to time axis it gives us 10 , which means the half life of iodine is 10 days

II) Your thyroid gland absorbs nearly all of the iodine in your body. Because of this, radioactive iodine (RAI, also called I-131) can be used to treat thyroid cancer. The RAI collects mainly in thyroid cells, where the radiation can destroy the thyroid gland and any other thyroid cells (including cancer cells) that take up iodine, with little effect on the rest of your body. The radiation dose used here is much stronger than the one used in radioiodine scans, which are described in Tests for Thyroid Cancer

Explanation:

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.