Answer:
The amount of reward that Sophia receives is 
Step-by-step explanation:
Let
x------> amount of reward that Sophia receives
y-----> amount of reward that Isabella receives
we know that

------> equation A
-----> equation B
Substitute equation A in equation B



Find the value of x

Sally collected 8 and Jake had 12. Together they had 20.
Ex 1 3/2
2 x 1 +3 5
------------ = ----- = 2.5
2 2
first denominator times whatever the whole number is then add that to the nominator than you have an improper fraction
because 3/2 = 1.5 then plus the whole number which is 1.0 = 2.5
The equation of a circle is defined by:
(x-h)^2+(y-k)^2=r^2
Where (h,k) s the center and r is the radius.
We can translate the word problem into (x+2)^2+(y-8)^2=16
:)
I think the answer would be 9? Correct me if I’m wrong