Someone knows how to do this? , me!

a   K=2

b   A =200

c  B = ±2

Step-by-step explanation:

A = kB^2

When A =50 B=5

Substitute these values in

50 = k * 5^2

50 = k*25

Divide by 25

50/25 = k25/25

2 =k

A = 2B^2

When B = 10

A = 2*10^2

A = 2 *100

A = 200

When A =8

8 =2B^2

Divide by 2

8/2 = 2/2B^2

4 = B^2

Take the square root

±sqrt(4) = sqrt(B^2)

±2 = B

this cant be answered without the graph. you may need to add it.