126 I hope that this is correct answer
Answer:
![(8x^4-7)+(3-2x^3 +9x^4) =17x^4 -3x^3 -4](https://tex.z-dn.net/?f=%288x%5E4-7%29%2B%283-2x%5E3%20%2B9x%5E4%29%20%3D17x%5E4%20-3x%5E3%20-4)
Step-by-step explanation:
Here, the given expression is: ![(8x^4-7)+(3-2x^3+9x^4)](https://tex.z-dn.net/?f=%288x%5E4-7%29%2B%283-2x%5E3%2B9x%5E4%29)
Simplifying the given expression, we get:
![(8x^4-7)+(3-2x^3 +9x^4) = (8x^4+9x^4 -3x^3 -7 +3)\\= 17x^4-3x^3 - 4\\\implies (8x^4-7)+(3-2x^3 +9x^4) = 17x^4-3x^3 - 4](https://tex.z-dn.net/?f=%288x%5E4-7%29%2B%283-2x%5E3%20%2B9x%5E4%29%20%3D%20%20%288x%5E4%2B9x%5E4%20-3x%5E3%20-7%20%2B3%29%5C%5C%3D%2017x%5E4-3x%5E3%20-%204%5C%5C%5Cimplies%20%288x%5E4-7%29%2B%283-2x%5E3%20%2B9x%5E4%29%20%3D%20%2017x%5E4-3x%5E3%20-%204)
Hence, on simplification : ![(8x^4-7)+(3-2x^3 +9x^4) = 17x^4 -3x^3 -4](https://tex.z-dn.net/?f=%288x%5E4-7%29%2B%283-2x%5E3%20%2B9x%5E4%29%20%3D%20%2017x%5E4%20-3x%5E3%20-4)
Let the original price be x
selling price = $34
discount = 15%
Therefore S.P. = 100-15/100 * x
So, x = 34 * 100/85
= 3400/85
= $40
21/5 = 126/30
If you divide 30 by 5 you get 6, then multiply the 6 into 21 to get 126
Look like that first one is supposed to have a denominator of 2.
This is a geometric series with a common ratio 4, so it diverges (absolute value 1 or more), meaning it has no sum. Choice C.