Answer:
-142
Step-by-step explanation:
So we have the function:
![f(x)=-x^2-9x+20](https://tex.z-dn.net/?f=f%28x%29%3D-x%5E2-9x%2B20)
To find f(9), substitute x for 9:
![f(9)=-(9)^2-9(9)+20](https://tex.z-dn.net/?f=f%289%29%3D-%289%29%5E2-9%289%29%2B20)
Square the first term and multiply the second:
![f(9)=-81-81+20](https://tex.z-dn.net/?f=f%289%29%3D-81-81%2B20)
Add:
![f(9)=-142](https://tex.z-dn.net/?f=f%289%29%3D-142)
And that's our answer :)
Since the average of 6 tests is 6, and we know that the average is found by dividing the total score by the number of tests, we can just multiply the average by the number of tests to find the total score. Doing this, we get 82 * 6 which simplifies to 492.
1st decimal place=tenth
2nd=hundreth
to round, you look at the place after it
so 13.8924439894 to tenth
look untill hundreth
13.89
if hundreth<u>></u>5, round tenth up
if hundreth place<5 leave tenth as is
13.89
9<u>></u>5
round up
8+1=9
13.9 is to theh tenth
Answer:
-0
Step-by-step explanation: