Answer:
14
Step-by-step explanation:
28=Diameter
Radius= D/2
=14
 
        
             
        
        
        
Answer:
The speed of the jet is 347 mph and the  speed of the wind is 18 mph.
Step-by-step explanation:
We have the following:
x = the speed of the jet in still air.
y = the speed of the wind
we know that the speed is equal to:
v = d / t
therefore the distance would be:
d = v * t
if we replace with the information of the exercise we have:
3 * (x + y) = 1095
3 * (x - y) = 987
we must solve this system of equations, add both equations and we are left:
3 * x + 3 * y = 1095
3 * x - 3 * y = 987
3 * x + 3 * y + 3 * x - 3 * y = 1095 + 987
6 * x = 2082
x = 2082/6 = 347
now to calculate y, we replace:
3 * (347 + y) = 1095
1041 + 3 * y = 1095
3 * y = 1095 - 1041
y = 54/3 = 18
The speed of the jet is 347 mph and the  speed of the wind is 18 mph.
 
        
             
        
        
        
350000 =  270000(1.05)^n
1.05)^n = 350000/270000 = 1.296296
n =  log 1.296296 / log 1.05 = 5.3 years answer
        
             
        
        
        
C’(500)=80 means at 500 pounds of documents, the cost is increasing at a rate of $80 dollars/pound