Answer:
a.x=4
b.x=4
c.(b)
Step-by-step explanation:
We are given that 

a. First we adding x on both sides we get


Now, subtract 5 on both sides we get


b.
We are subtracting 9 from both sides we get



We can solve equation both approach a and b
But I prefer (b) because in approach (b) 
There are only 3 step in which we can get answer but in approach (a) we can get answer in 4 steps .
Hence, I prefer approach (b)
 
        
             
        
        
        
Answer:
-5 times-5 times-5
Step-by-step explanation:
 
        
             
        
        
        
Answer:
3(9m + 13) - (m + 10) = 1
Step-by-step explanation:
Here, we want to write an equation we can use to find the age of Mario.
Let the present age of Mario be M 
Age of Sarah is 3 years older than 9
times Mario’s age 
Mario’s age is thus;
9m + 3 
In ten years, she will be 1 less than triple his age 
In 10 years time, sarah age will be 9m +
3 + 10 = 9m + 13 
Mario age will be m + 10
Mathematically;
3(9m + 13) - (m + 10) = 1
 
        
             
        
        
        
Answer:
390
Step-by-step explanation:
The formula of sum of arithmetic sequence is 
The number of this series are 2, 4, 6, 8, 10, 12, .  .  .  .  , 60.
The first term ( a ) = 2
The 30th even number is 60
The Tn is the term of the sequence 
So the equation is 
30/2 x ( 2 +  )
)
 = 60
 = 60
30/2 x ( 2 + 60 )
30/2 x (62)
1860/2
390