Q1 Which relation is a function? (Images listed)

Q2 Which relation is a function?

Select all that apply.

{(2, 1), (−2,1), (3, 2), (4,2)}

{(2, 1), (2,3), (−2, 5), (−2,7)}

{(−1, 2), (−2,2), (−3, 2), (−4,2)}

{(2, 2), (3,3), (4, 4), (5,5)}

{(2, 1), (2,3), (3, 4), (4,5)}

Q3 Which relation is a function?
(Image listed below)

coin flip

non-answer:

choosing

sorry if this isnt what you're looking for i dont really understand the question

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)