Answer:
3^9x=3^-2x
Step-by-step explanation:
 27^3x=(1/9)^x
3^3×3x=(1/3^2)^x
3^9x=3^-2x
 
        
             
        
        
        
Answer:
read the answer through and collect all the information you can
 
        
             
        
        
        
Answer:
40
Step-by-step explanation:
m+25=65
65-25=40
m=40
 
        
             
        
        
        
Answer:
option a)
 0.286
Step-by-step explanation:
Given that,
 number of red pens in cup = 5
 number of black pens in cup = 10
 number of pen randomly selected = 3
There are 5 red pens and 10 black pens. So there are 5 + 10 = 15 pens in all.
probability of having all red pens = (5/15 x 4/14 x 3/13)
                                                        = 2/91
probability of having all black pens = (10/15 x 9/14 x 8/13)
                                                            = 24/91 
probability that all pen are of same colour = 24/91 + 2/91
                                                                       =  2/7
                                                                       ≈ 0.286
 
        
             
        
        
        
From 86 books to 150 books. An increase of 64 books.
(150 - 86) / 86 = 64 / 86 = 0.744 * 100% = 74.40% or 74% increase
150 / 86 = 1.744 * 100% = 174.40% 
86 is the basis. It is 100%
If the problem asks for the value of the percentage increase and the rate is given 74.4% of 86. Then 86 * 74.4% = 64. You just add 64 to 86 to get the new total of books which is 150.