EXPLANATION
If the first two terms of an arithmetic sequence are 7 and 4, then we know that an arithmetic sequence has a constant difference d and is defined by

Check wheter the difference is constant:
Compute the differences of all the adjacent terms:

Replacing terms:
 4-7 = -3
The difference between all of the adjacent terms is the same and equal to
 d = -3
The first element of the sequence is


Therefore, the nth term is computed by
 d= -3
 

Refine
 d= -3 ,
 

Now, replacing n=7

So, the answer is -11.
 
        
             
        
        
        
Answer:
for number 10 it is a
Step-by-step explanation:
i don't know but i did do homework and i got number 10 right sorry.
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
To solve for q, we initially place everything with the term q to one side of the equality, and everything without the term q to the other side of the equality.
So


We find the square of both sides of the equation. So




 
        
             
        
        
        
R = dt
/d    /d
R/d = t
I think again
        
             
        
        
        
60 mins in an hour
18/60 is the fraction
3/10 is the simplest form (dividing by 6)