The first one is 156, the second 420 the third is 6,138 and the forth one is 64.
        
             
        
        
        
Answer:
A. t(x) = 450 - 0.06x
Step-by-step explanation:
The layer which is originally 450 m thick is decreasing by 0.06 m.
450 - 0.06
... per day. x represents days.
0.06x
So, 
450 - 0.06x
 
        
             
        
        
        
Step-by-step explanation:
Since, roots are - 3 & 2
Therefore, (x + 3) & (x - 2) would be factors. 
Leading coefficient is 5
Hence, required quadratic equation is:

 
        
             
        
        
        
take x =initial deposit amount. then make equation:
x+75.5+55.25-25.15-18.65 = 210.85
simplify:
x+86.95 = 210.85
x=210.85 - 86.95
x=123.90
so Initial deposit amount is $123.90
check:  210.85+18.65+25.15-55.25-75.5 = 123.9
123.9 = 123.9
 
        
             
        
        
        
Answer:
The Video recorders are inferior goods.
Step-by-step explanation:
As 
where;
The price of the recorders films are increasing by a term 1.07 which gives that the Price is increasing by a little. Also adding the Price of video recorder is increasing by a factor 2.1 and the Revenue or income is increasing by a term 5 (Which is high) so, revenue and price are increasing leaving the quality of the voice recorder decreasing by a large margin for maintaining the balance.
As
                                
So, in conclusion the quality decreases and thus the video recorders are inferior goods.