Answer:
-57
Step-by-step explanation:
13,8,3,-2 (decreasing by 5)
 13,8,3,-2,-7,-12,-17,-22,-27,-32,-37,-42,-47,-52,-57.
The 15th term is -57.
<u><em>Ace</em></u>
 
        
             
        
        
        
We have that  the fourth term of an arithmetic sequence is
a_4=14
Option C
From the question we are told 
What is the fourth term of an arithmetic sequence whose first term is 23 and whose seventh term is 5?
A) 78
B) 32
C) 14
(Explain your work)
Generally the equation for the  arithmetic sequence  is mathematically given as

Therefore
For seventh term

Therefore
For Fourth term

a_4=14
For more information on this visit
brainly.com/question/23366835
 
        
             
        
        
        
Answer:C or 11
Step-by-step explanation:
3x²-1 
First you insert x... which is 2
3(2)²-1
then you square the 2. (multiply it by itself)
3(4)-1
Then you multiply 3 by 4 to get 12
12-1
And then you subtract for your answer
11