<h2>
The value of x = 36</h2>
Step-by-step explanation:
 We have,
x, 45, 40 and 50 are in a proportion.
x : 45 : : 40 : 50
To find, the value of x = ?
We know that,
a : b : : c : d
Product of means = Product of extremes
a × d = b × c
∴ a × d = x × 50 
Also,
b × c = 45 × 40 
∴ x × 50 = 45 × 40 
⇒ x =  
 
⇒ x = 
 ⇒ x = 9 × 4 = 36
∴ The value of x = 36
 
        
        
        
Answer:
3x-y=15 should be the answer 
 
        
             
        
        
        
Option B:  is the correct answer.
 is the correct answer.
Explanation:
The exponential equation is 
If  , then
, then 
Thus, the equation becomes

Applying log rule,  and thus the equation becomes
 and thus the equation becomes

Since, we know that,  , using this we get,
, using this we get,

Hence, the logarithmic equation which is equivalent to the exponential equation  is
 is 
Thus, Option B is the correct answer.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Tutoring ABC - $50 sign up and $12 an hour
HW helps- $38 sign up and $15 an hour
  50                                    38
<u>+12</u>                                    <u>+15</u>
 62                                     53
<u>+12</u>                                   <u> +15</u>
 74                                     68                        Four months
<u>+12</u>                                  <u>+ 15</u>
 86                                     83
<u>+12</u>                                   <u>+15</u>
 98                                    98
 
        
             
        
        
        
What kind of subject do you tutor in ? c: