Answer:
Step-by-step explanation:
a number no less then 15
let the number be x
no less then 15....means it has to be 15 or more
x > = 15 (thats greater then or equal to)
 
        
             
        
        
        
Next time add an image, but know that the expression is equal to 657 since..
83 * 8 -7
Use PEMDAS
664 - 7
657
 
        
                    
             
        
        
        
Answer:
4 1/2=9/2 3 1/4=13/4
Step-by-step explanation:
Hope I helped!
Have a great day!
 
        
                    
             
        
        
        
Answer: After 7 years the population will be one-half the initial amount.
Step-by-step explanation:
Given: Initial population = 500,000 
The population declines according to the equation:
 , where P is the population in t years later.
, where P is the population in t years later. 
One-half the initial amount = 0.5 x 500,000 
= 250,000
Put P(t)=250,000, we get

Hence, After 7 years the population will be one-half the initial amount.