Radioactive iodine is used to determine the health of the thyroid gland it decays according to the equation y=ae^-0.0856t where t is in days find one fourth life of this substance

16.19 days.

Step-by-step explanation:

The radioactive iodine is used to determine the health of the thyroid gland and it decays according to the equation where t is in days and a is the initial amount and y is the final amount after decay for t days.

We have to find a one-fourth life of this substance.

So,

⇒

Now, taking ln both sides we get,

ln (0.25) = - 0.0856t ln e {Since, }

So, t = 16.19 days. (Answer)

b

step-by-step explanation:

two pairs of adjacent sides are of equal length. this implies that one diagonal divides the kite into congruent triangles, and so the angles between the two pairs of equal sides are equal in measure. it also implies that the diagonals are perpendicular.