Answer:  
Step-by-step explanation:
 We need to apply the following identity:

 Then, applying this, you know that for  :
:
 
 We need to remember that:
  and
 and 
 Therefore, we need to substitute these values into  .
.
 Then, you get:
 
 
 
 
        
             
        
        
        
Answer:
I got 23 so I am not sure sorry
 
        
             
        
        
        
I’m not sure if your answer is right but here’s how to solve it
 
        
        
        
Answer:
90 cents
Step-by-step explanation:
Find how much money you have by plugging in 18 as n into the expression:
5n
5(18)
Multiply:
= 90
So, when you have 18 nickels, you have 90 cents
 
        
             
        
        
        
The speed of the 747 jet is 545MPH and the speed of the 787 jet is 530MPH. that means the 747 jet is faster by 15MPH