This question is worded slightly strangely but I believe I understand it.
To eliminate x, multiply the second equation by 8, so that it becomes 4x + .8y= 96
<span>Then you can subtract 4x on the top by 4x on the bottom to eliminate it. </span>
What is 317.466 ounces or 19.8 pounds
1kg in household measurement is equal to 35.274 ounces.
So, 35.274*9= 317.466 ounces
317.466/16= 19.8 pounds
The third one because 2(15+5)=2(20)=40
The answer is B) <span>(60 - 4x)(50 + 2x) = 2,800
The revenue without any change in price is:
$60/student x 50 students = 3,000
Every price drop reduces the price/student by four, so the first term, which describes the fee per student, is 60 - 4x
Every price drop also increases the number of students by two, so the second term, which describes the number of students, is 50 + 2x</span>
Distribute the summation over the sum.
![\displaystyle \sum_{i=1}^{101} (-5a_i - 12b_i) = -5 \sum_{i=1}^{101} a_i - 12 \sum_{i=1}^{101} b_i](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Csum_%7Bi%3D1%7D%5E%7B101%7D%20%28-5a_i%20-%2012b_i%29%20%3D%20-5%20%5Csum_%7Bi%3D1%7D%5E%7B101%7D%20a_i%20-%2012%20%5Csum_%7Bi%3D1%7D%5E%7B101%7D%20b_i)
Now plug in the known sums and simplify.
![\displaystyle \sum_{i=1}^{101} (-5a_i - 12b_i) = -5(-12) - 12(-19) = \boxed{288}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Csum_%7Bi%3D1%7D%5E%7B101%7D%20%28-5a_i%20-%2012b_i%29%20%3D%20-5%28-12%29%20-%2012%28-19%29%20%3D%20%5Cboxed%7B288%7D)