Answer:

Step-by-step explanation:
start by foiling out the given function 

next, use the power rule to find the derivative 
power rule: To use the power rule, multiply the variable's exponent n, by its coefficient a, then subtract 1 from the exponent. If there's no coefficient (the coefficient is 1), then the exponent will become the new coefficient. 

 
        
             
        
        
        
Answer: (2,2)
Step-by-step explanation:
It is where the two lines intersect.
 
        
             
        
        
        
Answer:
System of equations:
20x + 30y = 650
x + y = 25
Time underwater = 10 hours
Time at the surface = 15 hours
Step-by-step explanation:
Let x = time underwater at 20 km/h.
Let y = time on the surface at 30 km/h.
speed = distance/time
distance = speed * time
distance underwater: 20x
distance on the surface: 30y
total distance: 650
20x + 30y = 650
total time: x + y
total time: 25
x + y = 25
20x + 30y = 650
x + y = 25
20x + 30y = 650
-20x - 20y = -500
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           10y = 150
               y = 15
x + y = 25
x + 15 = 25
x = 10
 
        
             
        
        
        
Divide each term by 4+8 and simplify.
x<span>≥25/12
</span>
        
             
        
        
        
Step-by-step explanation:
1. Vertical 
2. Alternate 
3. congruent 
4. AAS or SAA