I think the answer would be B that could represent function R
Answer:
411
Step-by-step explanation:
1644/4=411
0.75 x 14 = 10.50
15 - 10.50 = 4.50
your answer is : Sharon will receive $4.50 change
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.
D to balance the numbers out to zero both are positive so the answer is d