4. 5x+6.25
5.2x+40
6.3x+ -6
7. 1x+ 1/5
Answer:
The crop yield increased by 9 pounds per acre from year 1 to year 10.
Step-by-step explanation:
To solve this we are using the average rate of change formula:
, where:
is the second point in the function
is the first point in the function
is the function evaluated at the second point
is the function evaluated at the first point
We know that the first point is 1 year and the second point is 10 years, so
and
. Replacing values:
![Av=\frac{-(10)^2+20(10)+50-[-(1)^2+20(1)+50]}{10-1}](https://tex.z-dn.net/?f=Av%3D%5Cfrac%7B-%2810%29%5E2%2B20%2810%29%2B50-%5B-%281%29%5E2%2B20%281%29%2B50%5D%7D%7B10-1%7D)
![Av=\frac{-100+200+50-[-1+20+50]}{9}](https://tex.z-dn.net/?f=Av%3D%5Cfrac%7B-100%2B200%2B50-%5B-1%2B20%2B50%5D%7D%7B9%7D)
![Av=\frac{150-[69]}{9}](https://tex.z-dn.net/?f=Av%3D%5Cfrac%7B150-%5B69%5D%7D%7B9%7D)



Since
represents the number of pounds per acre and
the number of years, we can conclude that the crop yield increased by 9 pounds per acre from year 1 to year 10.
Hey there!
To simplify radical expressions, refer to the conversion of a radical expression to a number with an exponent:
![\sqrt[a]{x} = x^{\frac{1}{a} }](https://tex.z-dn.net/?f=%20%5Csqrt%5Ba%5D%7Bx%7D%20%3D%20%20x%5E%7B%5Cfrac%7B1%7D%7Ba%7D%20%7D%20)
Remember that if you don't see an index, there is an implied "2" that will go where "a" is.
Depending on your problem, you could also cancel a radical by raising the entire expression by the second power (only if your index is 2).
Hope this helped you out! :-)
40+20=60 +4= 64 that is the answer