To find the maximum height, we must find the x value at which the maximum height occurs.
The maximum height occurs at x = 0 because that is where y is the largest.
When we plug x= 0 into the function that is given in the question, we get 630 ft.
Hope it helps!
 
        
                    
             
        
        
        
-5x - 7 < 28.....add 7 to both sides
-5x < 35....divide both sides by -5, change the inequality sign (u change the inequality sign when dividing/multiplying by a negative number)
x > -7
        
             
        
        
        
Answer:
 (1,155, 1.545).
Step-by-step explanation:
From Normal distribution tables the z score for 95% CI  = 1.96.
Confidence Interval 
= 1.35 +/- 1.96 * 0.63/√40
=  1.35 +/- 0.195
 =  (1,155, 1.545).
 
        
             
        
        
        
4.75 Kilometers, you just divide by 1000