Answer:
![Area = 51.68yd^2](https://tex.z-dn.net/?f=Area%20%3D%2051.68yd%5E2)
Step-by-step explanation:
Given
-- height
--- base sides
Required
Determine the surface area
The net is not given. So, I will solve directly.
The surface area is calculated as:
![Area = a^2 + 2a\sqrt{\frac{a^2}{4} + h^2}](https://tex.z-dn.net/?f=Area%20%3D%20a%5E2%20%2B%202a%5Csqrt%7B%5Cfrac%7Ba%5E2%7D%7B4%7D%20%2B%20h%5E2%7D)
So, we have:
![Area = 2.5^2 + 2*2.5\sqrt{\frac{2.5^2}{4} + 9^2}](https://tex.z-dn.net/?f=Area%20%3D%202.5%5E2%20%2B%202%2A2.5%5Csqrt%7B%5Cfrac%7B2.5%5E2%7D%7B4%7D%20%2B%209%5E2%7D)
![Area = 6.25 + 5\sqrt{\frac{6.25}{4} + 81}](https://tex.z-dn.net/?f=Area%20%3D%206.25%20%2B%205%5Csqrt%7B%5Cfrac%7B6.25%7D%7B4%7D%20%2B%2081%7D)
![Area = 6.25 + 5\sqrt{1.5625 + 81}](https://tex.z-dn.net/?f=Area%20%3D%206.25%20%2B%205%5Csqrt%7B1.5625%20%2B%2081%7D)
![Area = 6.25 + 5\sqrt{82.5625}](https://tex.z-dn.net/?f=Area%20%3D%206.25%20%2B%205%5Csqrt%7B82.5625%7D)
![Area = 6.25 + 5* 9.086](https://tex.z-dn.net/?f=Area%20%3D%206.25%20%2B%205%2A%209.086)
To determine a percentage difference, simply divide the difference of the two numbers by the original. For instance, 82-65.60=16.4 16.4 is 20% of 82, so the discount is 20% (16.4/82)
To solve for this, we need to multiply 55 balloons by 30 days to get the average total, and then the remainder.
(55 x 30) + 245 = 1895 total balloons to begin with.