Answer: plants are same height in 30 days;  Plant A is tallest in 6 weeks
Step-by-step explanation:
x =  number of days
4 + (2/3)x = 9 + (1/2)x
(2/3)x - (1/2)x = 9 - 4
(1/6)x = 5
x = 30, number of days for Plant A and Plant B to be same height.
6 wks = 42 days
Plant A in 42 days:  4 + (2/3)(42) = 32 inches
Plant B in 42 days:  9 + (1/2)(42) = 30 inches
 
        
             
        
        
        
Answer:
I'm newbie here 
Step-by-step explanation:
Elimination Method.
4x + 6/y = 15 → step 1 
6x - 8/y = 14 → step 2
so, 
4x + 6/y = 15 |×6| 
6x - 8/y = 14 |×4|
24x + 6/y(6) = 90
24x - 8/y(4) = 56
24x + 36/y = 90
24x - 32/y = 56
____________ _ 
 68/y = 34
 68 = 34y 
 34y = 68
 y = 2 
subsitution y = 2 to..
4x + 6/y = 15 
4x + 6/2 = 15 
4x + 3 = 15 
4x = 12
x = 3 
So, for x is 3, and for y is 2 
 
 
        
                    
             
        
        
        
F=ar^t if the half-life is 96 years...
.5=r^96
ln(.5)=96lnr
ln(.5)/96=lnr
r=e^((ln.5)/96)
f=800e^(336(ln.5)/96)
f=70.71
So about 71mg will remain after 336 years.
        
                    
             
        
        
        
Answer:
-64
Step-by-step explanation:
5(x – 6) + 3x – 2
Distribute
5x - 30 +3x -2
Combine like terms
8x -32
Let x = -4
8*-4 -32
-32 -32
-64