Answer:
1/3
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
h=-5t²+135
when t=3 s
h=-5(3)²+135=-45+135=90 m
 
        
             
        
        
        
Answer:
12-4√5
Step-by-step explanation:
(√10-√2)²
(√10-√2)(√10-√2)
Foil/distribute
10-√20-√20+2
12-2√20
12-2√4*√5
12-2*2√5
12-4√5
 
        
             
        
        
        
You can do this by comparing your equation to the general form of equation of a circle
( x - a)^2 + (y - b)^2 = r^2       where (a,b) is the centre and r = radius:-
(x  + 9)^2   (y + 6)^2 = 9 
so (a,b) = (-9,-6)  and r = 3
so the answer is B
        
                    
             
        
        
        
It is negative because the plot is going down not up