It’s a ! you add both of the numbers to get your missing perimeter.
I’m very sorry if it’s wrong but this is what I believe! stay safe
Step-by-step explanation:
integral fx = gx, gx = fx
gx = -4x2
variable of x2 = replace to left side it mean we got minus when Variable replace to left it mean minus
Remember order of operations (PEMDAS):
3•(11-1/2)
3•10.5
31.5