Answer:

Step-by-step explanation:
Given that,
The value of 
We need to find an expression for
. To find it, put the value of n as (n-1). So,

Hence, the value of S(n-1) is equal to
.
Answer:
The answer is -48
Step-by-step explanation:
First step is to follow PEMDAS
So we start solving whatever is in the ( )
4^2 is in the ( ) 4^2 = 16 then we multiply
-3 * 16 which is -48
-
Answer:
194.3 miles/h
Step-by-step explanation:
avarage speed = total distanse/total time
194.3/1
5^2-100=X
(5*5)
25-100=X
-75=X
hope this helps