Answer is in the photo. I can only upload it to a file hosting service. link below!
shorturl.at/ipxUY
N = N₀* 
where N is how much you currently have
N₀ is the starting amount
t is the time
and h is the half life of the substance.
I'm not sure let me ask this girl I know her name is Jade
Answer:
Looking at this, slope seems to be 2 for the graph
So, looking at your options, -4 is less than 2, therefore, the answer is
D, with slope -4
Answer:
t=21
Step-by-step explanation: