i have online math questions i need someone to help me on them please

i have online math questions i need someone to help me on them please

DOCTORS use radioactive iodine as a tracer in diagnosing certain thyroid gland disorders. This type of iodine decays in such a way that the mass remaining after days is given by the function

m(t) = 6e−0.089t

where 
m(
t) is measured in grams.

(a) Find the mass at time t = 0.
 grams

(b) How much of the mass remains after 2 days? (Round YOUR answer to three decimal places.)
 grams