Answer:
Step-by-step explanation:
hello : 
put x = -5 in this equation : a(4-x) =-3x + b
a(4+5) =15 + b
9a = 15 +b 
b = 9a - 15
the values of a and b is all order  pair :   ( a  ; 9a-15)  a real number
 
        
             
        
        
        
X could either be 4 or 5, depending on which x the question asks. If you have to chose one answer go with 5 because it's associated with the y.
 
        
        
        
Hmmm the object, is at rest, when dropped, so it has a velocity of 0 ft/s
the only force acting on the object, is gravity, using feet will then be -32ft/s²,
was wondering myself on -32 or 32.. but anyhow... we'll settle for the negative value, since it seems to be just a bit of convention issues
so, we'll do the integral to get v(t) then

when will it reach the ground level? let's set s(t) = 0

part B)  check the picture below
 
        
        
        
Basically you do 25.50 time .15 (15% is equal to .15) and you get 3.825 or $3.83 
hope this helped