Answer:
To find the area of a circle you use the formula 
r is the radius so plug that in.
if you only have the diameter, just divide that number by 2 to get the radius
Multiply 40 by the total cost of the whole sale and you answer is that:)
Answer:D
Step-by-step explanation:It has the most dots on it from what I counted
Answer:

Step-by-step explanation:
Given that,
The dimensions of an aquarium are 61 cm long, 30.5 cm wide, and 30.5 cm high.
The tank is filled to 80% capacity with water.
We need to find the water needed for this tank.
The volume of cuboid is given by :

As it is filled to 80% capacity, so,

So,
of water is needed for this tank.
Like before just put Xs one side and numbers other