Answer:

Step-by-step explanation:
Arithmetic sequences have the following form

Where
is the first term of the series
d is the common difference between consecutive terms.
is the nth term.
The formula to find the sum Sn of the first n terms of an arithmetic series is:

In this case
,
, 


Then:


You can also find the sum through the following series



Answer:
3 and 4
Step-by-step explanation:
Answer: The expression, 8 x 54, may also be expressed as 8 x 50 + 8 x 4 because by factoring the 8,
8 x (50 + 4) = 8 x 54
Further, it can also be expressed as,
8 x 60 - 8 x 6
because,
8 x (60 - 6) = 8 x 54
Step-by-step explanation: