$40
40*90/100 = 36
You just have to be careful with the rest of the problem
I'm sorry I don't know but you can use photomath you can just download it from the App
Sry can't answer your question but I'll keep trying to figure it out :(
Answer:
inverse operations (KristaKingMath)
Answer:
The perimeter is 
Step-by-step explanation:
we know that
The perimeter of the figure is equal to the circumference of a semicircle
plus the perimeter of a square minus the diameter of the circle
so

we have



The diameter of the circle is equal to the length side of the square
substitute


