Answer:
300
Step-by-step explanation:
Let x = cost of desktop computer; then x - 250 = cost of laptop computer
 
converting % to decimals, 9% = 0.09 and 6% = 0.06
 
Then, 0.09x + (x - 250)0.06 = $300
0.09x + 0.06x - 15 = $300
0.15x = $315
x = $2100
then x - 250 = $1850
 
Proof: $2100•0.09 + 1850•0.06 = $189 + $111 = $300
 
        
             
        
        
        
To answer problems like this you have to use binomial:
P (x > 1) = 1 – p (0
< x < 1) > .7 
So:
1 – p (0) – p (1) >
.7 
1 – (3/ 4) ^n – (3/ 4)
^n (n – 1 ) (1/ 4) > .7 
Therefore n > 5.185,
and the smallest value of n so that we can satisfy the given condition is 6
(rounded up)
<span> </span>
 
        
             
        
        
        
Answer:
B. 407
Step-by-step explanation:
equation: y= A(1- r/n)^nt
y=471(1-(.07/1))^1(2)
you should get 407.37 as your answer
 
        
                    
             
        
        
        
Answer:
.20
Step-by-step explanation:
75/500 = .15 
35-15=20