Answer:
The answer is 5/8
Step-by-step explanation:
 
        
             
        
        
        
The jar has 138 grams of zinc.
<u>Solution:</u>
Given that , In a certain chemical reaction, the ratio of zinc to copper is 3 to 16.  
A jar of the chemical contains 736 grams of copper.  
We have to find how many grams of zinc does it contain
Let "n" be the grams of zinc needed for 736 grams of copper  
Now, we know that,  
16 grams of copper ⇒ 3 grams of zinc
Then, 736 grams of copper ⇒ n grams of zinc
So, by criss cross multiplication,

16n = 3 x 736
16n = 2208
n = 138
Hence, the jar has 138 grams of zinc.
 
        
             
        
        
        
Let's say the numbers are "a" and "b"
thus 

set the derivative to 0, and check the critical points, there's only one anyway
and do a first-derivative test, to see if it's a maximum
 
        
        
        
Answer:
144 km
Step-by-step explanation:
1 hour and a half hour = 90 minutes.
In 15 minutes a car travels 24 km
In 1 minute a car travels (24÷15) = 1.6 km
In 90 minutes a car travels (90×1.6)= 144 km
Ans.- 144 km
 
        
             
        
        
        
Answer:
sorry but i need some points right now so just ignore this
Step-by-step explanation: