Answer:
he's right its D
Step-by-step explanation:
Answer:

Step-by-step explanation:
Given that,
The sum of first n term of a sequence is
We need to find the sum of the first 5 terms.
Put n = 5,

So, the sum of first 5 terms is equal to
.
Answer:
40ft
Step-by-step explanation:
Please kindly see the attached file for more explanation
Answer:
:) 17
Step-by-step explanation:
68 = 4 x L
68 div by 4 = 17
the length is 17
The Second one hope it helped