The equation only is true for objects with negligible air resistance. A feather does not have this property. 
Using the equation shown: 
50 = -16t^2 
t^2 = 50/16 = 3.125 
t = sqrt(3.125) = 1.77 seconds
        
             
        
        
        
Step-by-step explanation:
x²+4x=8
rearrange
x² + 4x - 8 = 0
half of 4 is 2
so
x² + 4x + 2² - 2² - 8 = 0
do x² + 4x + 2²
multiplies to give 4 adds to give 4
2+ 2
(x + 2)²
(x + 2)² - 2² - 8
(x + 2)² - 4 - 8
(x + 2)² - 12
(x + 2 + √12) (x + 2 - √12)
√12 = √4 * √3 = 2 √3
(x + 2 + 2√3) (x + 2 - 2√3)
 
        
             
        
        
        
Answer:
23
Step-by-step explanation:
3(-2)2-2(-2)+7
3(4)-(-4)+7
12+4+7
 
        
             
        
        
        
Answer:
first make everything inches so you have at least 62 inches and at most 73 inches, now create it. 
Step-by-step explanation:
62<x<=73