+0  
 
0
88
1
avatar

The first term of an arithmetic sequence is -8. Find the 20th term if the sum of the first 20 terms is 790.

 Jul 2, 2020
 #1
avatar
0

[- 8 + L]/2 * 20 = 790, solve for L
[-8 + L] * 10 = 790
[-8 + L] = 79
L =79+8 = 87 - The last and 20th term.

 Jul 2, 2020

31 Online Users

avatar