Simple...
you have: 6a+3b-8
a=4 and b=5
Plug in what you know-->>
6(4)+3(5)-8
24+15-8
39-8
31
Thus, your answer.
        
             
        
        
        
Answer:Q=1.39 or -0.103
Step-by-step explanation:
 
        
             
        
        
        
The maximum height is 144 feet.
The maximum height is the y-coordinate of the vertex.  To find the vertex, we first use x = -b/2a.  For our information, that is x=-64/2(-16) = -64/-32 = 2.
Now we substitute this into the equation:
y = -16(2²) + 64(2) + 80 = -64 + 128 + 80 = 144
        
             
        
        
        
Answer:
Step-by-step explanation:
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The answer to your question is $720