I believe it’s 12000 because 30x50=1500 1500x2=3000 now 3000x4=12000
250 + 2(25.50) + 105.50 = 250 + 51 + 105.50 = 406.50 <==
A. -1/4(x-10)^2
The screenshot shows the graph
P=s1+s2+s3
Move +s1 to the other side. Sign changes from +s1 to -s1
P-s1=s1-s1+s2+s3
p-s1=s2+s3
Move s2 to the other side. Sign changes from s2 to -s2
p-s1-s2=s2-s2+s3
p-s1-s2=s3
Answer: p-s1-s2=s3
X^2 + 9 + 7 = 20
X^2 +16 = 20
X^2 = 20-16
X^2 = 4
Root 4 = 2
X=2