Answer:
Let 'a' be the first term, 'r' be the common ratio and 'n' be the number of terms
Series = 2+6+18.......= 2+2•3¹+ 2•3².......= 728
Now, 

So,

Therefore, number of terms is 6
 
        
             
        
        
        
Answer: y=-4x-3
Step-by-step explanation:
just draw all the lines on a graph
 
        
             
        
        
        
Answer:
The answer is 100
Step-by-step explanation:
 
        
             
        
        
        
Answer:
90⁰ 
Step-by-step explanation:
y=cosx
y'= -sinx
eqñ of tangent is y=-x
slope of tangent =-1
we know...
slope of tangent = y' or derivative of y
-sin x = -1 
sin x= 1
x = 90⁰