I think the answer would be c
Answer:

Step-by-step explanation:
Given: a graph
To find: the average rate of change of the amount of the element over the 10-minute experiment
Solution:
A rate of change of one quantity with respect to another quantity is known as rate of change. If y is the dependent variable and x is the independent variable then average rate of change = change in y /change in x.
From the graph,
change in x (time) =
minutes
change in y ( amount of the element) =
g
So, average rate of change = 
45-15= 30-28= 2+18=20
Is that what the question was asking??
jonas wants to mail a package that weighs 4.2 kilogram. how much dose the package weigh in pounds?
we know that
1 kg = 2.20462262185 lb
1 kg=2.2 lb
we have
4.2 kg
Convert to pounds
so
4.2 kg=4.2*(2.2)=9.24 pounds
therefore
the answer is 9.24 pounds
8x+6=54
-6 -6
8x=48
8x /8=48/8
x=6 the bracelets were $6 a piece