4Th option is correct ✔️ ✔️
Answer:

Step-by-step explanation:
A calculator shows the value of
meaning that each day, about 99.4% of the sample remains.
The formula 
Evaluate this at <em>t</em> = 16 to get 91 grams remain.
Answer:
f(x)=-16(x-1)^2+22
Step-by-step explanation:
Without values for the other variables, I assume you're asking for a literal equation.
12y+d=-19y+t
31y+d=t
31y=-d+t
y=(-d+t)/31