Kate has 79 more envelopes to stamp before
she can send off her wedding invitations.
if she is sending 234 invitations in all, how
many has she stamped so far?

idk

step-by-step explanation: i just don't

d is the answer

step-by-step explanation:

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: