If an is a5
and
an-1 is a4
then using your recursive formula for an arithmetic sequence
an=an-1 +d
then
a5=a4+d
now, a4 =6 and common difference "d" is d=-11
hence
a5=6 -11
6-11= -5
any questions?
Answer:
B is correct
Step-by-step explanation:
Can you show the paper more? I can't see what I need to know in order to solve it...
Answer:
The lateral area of the regular prism is 
Step-by-step explanation:
we know that
The lateral area of the regular prism is equal to

where
P is the perimeter of the base
h is the height of the prism
<em>Find the perimeter of base P</em>
-----> the regular pentagon has 5 equal sides
we have

substitute in the formula
