Answer:
Option C is correct.
![7 \cdot \sum_{i=1}^{18} i^2 + 9 \cdot 18](https://tex.z-dn.net/?f=7%20%5Ccdot%20%5Csum_%7Bi%3D1%7D%5E%7B18%7D%20i%5E2%20%2B%209%20%5Ccdot%2018)
Step-by-step explanation:
Given the expression: ![\sum_{i=1}^{18} (7i^2+9)](https://tex.z-dn.net/?f=%5Csum_%7Bi%3D1%7D%5E%7B18%7D%20%287i%5E2%2B9%29)
Using properties of summation:
Using properties of summation in the given expression we have;
= ![\sum_{i=1}^{18} 7i^2 + \sum_{i=1}^{18} 9](https://tex.z-dn.net/?f=%5Csum_%7Bi%3D1%7D%5E%7B18%7D%207i%5E2%20%2B%20%5Csum_%7Bi%3D1%7D%5E%7B18%7D%209)
=![7 \cdot \sum_{i=1}^{18} i^2 + 9 \cdot 18](https://tex.z-dn.net/?f=7%20%5Ccdot%20%5Csum_%7Bi%3D1%7D%5E%7B18%7D%20i%5E2%20%2B%209%20%5Ccdot%2018)
Therefore, the following given expression uses the properties of summation to represents is, ![7 \cdot \sum_{i=1}^{18} i^2 + 9 \cdot 18](https://tex.z-dn.net/?f=7%20%5Ccdot%20%5Csum_%7Bi%3D1%7D%5E%7B18%7D%20i%5E2%20%2B%209%20%5Ccdot%2018)
Answer:
C
Step-by-step explanation:
Both of the y= make upward parabolas
It is also going into the positive direction so it is
Step-by-step explanation:
Assuming that the company only consists of men and women, then the ratio of women to the total number of employees in the company is 5 : (7 + 5) = 5 : 12.
Since there are 140 women working for the company, there are 140 * 12/5 = 336 employees.
Answer:
Yes it is all correct
Step-by-step explanation:
Good job!!
She did 12 questions, and needs to do 36.
36 / 12 = 3, so it will take 3 times as long.
1 hour 20 minutes times 3 = 4 hours.
It will take her 4 hours.