Answer:
I think D but I'm not sure about that
Answer:
t(x) = 450 - 0.06x
Step-by-step explanation:
1. Use the FOIL method (x+9)(x+9)
First, outer, inner, last
![x^{2} +9x+9x+81](https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20%2B9x%2B9x%2B81)
Add your like terms
![x^{2} +18x+81](https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20%2B18x%2B81)
2. When you add or subtract polynomials you add or subtract the like terms and then put them in order from largest to smallest exponents.
3.
![-5x(5 x^{3} +10 x^{2} -6x+3)](https://tex.z-dn.net/?f=-5x%285%20x%5E%7B3%7D%20%2B10%20x%5E%7B2%7D%20-6x%2B3%29)
4. Since it is the perimeter, we add the 3 together.
![(2 x^{2} +4x-3)+(-3 x^{2} -3)+(5x+19)](https://tex.z-dn.net/?f=%282%20x%5E%7B2%7D%20%2B4x-3%29%2B%28-3%20x%5E%7B2%7D%20-3%29%2B%285x%2B19%29)
Add the like terms together:
![2 x^{2} +(-3 x^{2} )=- x^{2} \\ 4x+5x=9x \\ -8+(-3)+19=8](https://tex.z-dn.net/?f=2%20x%5E%7B2%7D%20%2B%28-3%20x%5E%7B2%7D%20%29%3D-%20x%5E%7B2%7D%20%20%5C%5C%204x%2B5x%3D9x%20%5C%5C%20-8%2B%28-3%29%2B19%3D8)
Put them in order of exponents
![- x^{2} +9x+8](https://tex.z-dn.net/?f=-%20x%5E%7B2%7D%20%2B9x%2B8)
Hope this helps
![\dfrac{2}{9} \text { of the saving} = \$72](https://tex.z-dn.net/?f=%20%5Cdfrac%7B2%7D%7B9%7D%20%5Ctext%20%7B%20of%20the%20saving%7D%20%3D%20%5C%2472)
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Find 1/9 :
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![\dfrac{1}{9} \text { of the saving} = \$72 \div 2](https://tex.z-dn.net/?f=%20%5Cdfrac%7B1%7D%7B9%7D%20%5Ctext%20%7B%20of%20the%20saving%7D%20%3D%20%5C%2472%20%5Cdiv%202)
![\dfrac{1}{9} \text { of the saving} = \$36](https://tex.z-dn.net/?f=%20%5Cdfrac%7B1%7D%7B9%7D%20%5Ctext%20%7B%20of%20the%20saving%7D%20%3D%20%5C%2436)
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Find 9/9 :
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![\dfrac{9}{9} \text { of the saving} = \$36 \times 9](https://tex.z-dn.net/?f=%20%5Cdfrac%7B9%7D%7B9%7D%20%5Ctext%20%7B%20of%20the%20saving%7D%20%3D%20%5C%2436%20%5Ctimes%209)
![\dfrac{9}{9} \text { of the saving} = \$324](https://tex.z-dn.net/?f=%20%5Cdfrac%7B9%7D%7B9%7D%20%5Ctext%20%7B%20of%20the%20saving%7D%20%3D%20%5C%24324)
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Answer: The total amount is $324.-----------------------------------------------