Answer:9+2<17
Step-by-step explanation:
 
        
             
        
        
        
3x + 1 + 5x = 7 + 15 + 7x
 8x + 1 = 22 + 7x
 x = 21
        
             
        
        
        
Answer:
c-12
Step-by-step explanation:
Pythagoras theorem states that a²+b²=c²
144+b²=c²
b²=c²-144
b=c-12
b=x
x=c-12
 
        
             
        
        
        
X=28
It is simple just do percentases and then all the outside stuff
        
                    
             
        
        
        
<u>ANSWER:
</u>
Zach has 28 dimes and 7 quarters.
<u>SOLUTION:
</u>
Given, Zach has 4 times as many dimes as quarters  
And they have a combined value of 455 cents,  
We need to find how many of each coins does he have?
Let, the number of dimes be x and number of quarters be y.
Then, x = 4y → (1)
Total combined value = 455 cents
x(value of one dime) + y(value of one quarter) = 455 cents
x(10 cents) + x(25 cents) = 455 cents
10x + 25y = 455 → (2)
Now, substitute (1) in (2)
10(4y) + 25y = 455
40x + 25y = 455
65y = 455
y = 7
substitute y value in (1)
x = 4(7)  = 28
Hence, zach has 28 dimes and 7 quarters.