Answer:
Step-by-step explanation:
Sum Of Arithmetic Sequence
Given an arithmetic sequence
The sum of the n first terms is
Or equivalently
![\displaystyle S_n=\frac{[2a_1+(n-1)r]n}{2}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20S_n%3D%5Cfrac%7B%5B2a_1%2B%28n-1%29r%5Dn%7D%7B2%7D)
The given sequence is
5, 8, 11 ...
We can see the common difference between terms is r=3
We are asked to find the sum of the terms 2 to 5, it means that
![\displaystyle S_4=\frac{[2(8)+(4-1)3]4}{2}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20S_4%3D%5Cfrac%7B%5B2%288%29%2B%284-1%293%5D4%7D%7B2%7D)
Answer: 10
Step-by-step explanation:
These types of questions involve ratios. So 2.5: 25 is equal to 25 : 250 and all i did was multiply both sides by 10. Then it says that he only has 1 pound of ground beef so 25* 1/25 is equal to one, and then 250 * 1/25 is equal to 10.
Answer: The zero will be at 2 when the line hit the x-axis
Step-by-step explanation:
Caculate
Answer: -12 but could be wrong
Step-by-step explanation:
I don't know that format but I'm going to take a guess.
x^2 +2x - 8 -(2x+8) then plug in x=2
x^2 + 2x - 8 - 2x - 8
x^2 -16
= 2^2 - 16 = -12
