Answer:
 Nasa picture po yung answer
 
        
             
        
        
        
The formula of the Simple Interest is:
I=PRT
P for Principle Amount     ($1200)
R for Rate                        (5%=

 = 0.05)
T for Time in years          (4 years)
I = 1200 × 0.05 × 4
  = $240
Add the interest to the principle amount to check the balance
$1200 + $240 = $1440
 
        
        
        
Yes, I believe they are equivalent because if you were to solve -1/4(10t-15) it would equal -2t+3