Let's call the younger student's age A and the older student's age B. The teacher's age will be T.
B = 2A
T = 5B
T+5 = 5(A+5)
Simplify the last equation.
T+5 = 5A+25
T = 5A+20
Now we have two equations solved for T, so we can set them equal to each other.
5B = 5A + 20
We can plug 2A in for B
5(2A) = 5A + 20
10A = 5A + 20
5A = 20
A = 4
To find T, we plug 4 in for A in T = 5A + 20
T = 5(4) + 20
T = 40
The answer is 40 years old.
        
                    
             
        
        
        
Answer:
X = 4
Step-by-step explanation:
you just gotta subtract 1 from both sides in order to find what x equals. and from there you subtract x from both sides, any letter has an invisible 1 in front, so then you divide 2 from both sides. and you get x = 4
 
        
             
        
        
        
Answer:

Step-by-step explanation:
The difference of two squares identity is

When we let 

and 

, we get:

This will simplify to give us the required factors

 
        
             
        
        
        
The number of viruses was 4000 times greater than number of protozoa.
Step-by-step explanation:
Given, 
Number of protozoa = 
Number of viruses = 
Let,
x be the number of times number of viruses is greater than number of protozoa.
Number of viruses = Number of time * Number of protozoa

Dividing both sides by 

The number of viruses was 4000 times greater than number of protozoa.
Keywords: division, scientific notation
Learn more about division at:
#LearnwithBrainly
 
        
             
        
        
        
Answer:
I've done this before my friend...