Answer:
2. You take 15 and subtract it by 13 which equals 2.
Step-by-step explanation:
(x-a)^2 + (y-b)^2=r^2
Where a and b is the center of the circle. Therefore your answer is:
(x-5)^2 + (y+13)^2=1296
Answer:
-5
Step-by-step explanation:
The dot means multiply: so 
Also: 5² = 5 x 5 = 25
Therefore,
Since it is about only the outer part of the aquarium which is made of glasses we need to calculate the total surface area.
Surface area of the base = 4*3 = 12 square feet
Surface area of the shorter length of wall = 3*2 = 6 square feet
since it has another wall in opposite side. It has to be multiplied with 2.
6*2 = 12 square feet
Surface area of the longer length of wall = 4*2 = 8 square feet
since it has another wall in opposite side. It has to be multiplied with 2.
8*2 = 16 square feet
Therefore the total surface area that need to be covered with glasses
12+12+16 = 40 square feet
