If your class is composed by
students (you including), we deduce that
students took the test. Let
be the grades of your colleagues. We have
![\dfrac{g_1+g_2+\ldots+g_{n-1}}{n-1}=69 \iff g_1+g_2+\ldots+g_{n-1}=69(n-1)](https://tex.z-dn.net/?f=%5Cdfrac%7Bg_1%2Bg_2%2B%5Cldots%2Bg_%7Bn-1%7D%7D%7Bn-1%7D%3D69%20%5Ciff%20g_1%2Bg_2%2B%5Cldots%2Bg_%7Bn-1%7D%3D69%28n-1%29)
If we consider your grade as well, the new average will be
![\dfrac{g_1+g_2+\ldots+g_{n-1}+g_n}{n}=70 \iff \dfrac{69(n-1)+95}{n}=70](https://tex.z-dn.net/?f=%5Cdfrac%7Bg_1%2Bg_2%2B%5Cldots%2Bg_%7Bn-1%7D%2Bg_n%7D%7Bn%7D%3D70%20%5Ciff%20%5Cdfrac%7B69%28n-1%29%2B95%7D%7Bn%7D%3D70)
Solving this equation for n, we have
![\dfrac{69(n-1)+95}{n}=70 \iff 69n-69+95=70n \iff n=95-69=26](https://tex.z-dn.net/?f=%5Cdfrac%7B69%28n-1%29%2B95%7D%7Bn%7D%3D70%20%5Ciff%2069n-69%2B95%3D70n%20%5Ciff%20n%3D95-69%3D26)
Ok, on the table is says f(x), in the question is says f where x is -2, so go down the f(x) side of the table and find the number it correlates with, which is 3 :)
Answer:
75.38
Step-by-step explanation:
(16.75*4)+(16.75*1/2)
Answer:
The equation is y=1/2x+5
Step-by-step explanation:
Answer:
11m-12
Step-by-step explanation:
3×m=3m 3×-4=-12
8m+3m=11m
11m-12