Use the FOLD method<span>
(a+b)(c+d)=ac+ad+bc+bd
</span><span>−12<span>s<span><span>^2 </span><span></span></span></span>+ 3st + 8ts − 2<span>t<span><span>^2</span><span>
</span></span></span></span>Collect like terms
-12{s}^{2}+(3st+8st)-2{t}^{2}
Simplify
<span>-12{s}^{2}+11st-2{t}^{2}<span>−12<span>s<span><span>2</span><span></span></span></span>+11st−2<span>t<span><span>2
The answer is = -12s^2 + 11st - 2t^2</span></span></span></span></span>
        
             
        
        
        
Answer: The statue, originally intended to be only 10 feet tall, was on further consideration enlarged so that it finally stood 19 feet tall from head to foot, the scale being such that if Lincoln were standing he would be 28 feet tall.
Step-by-step explanation: hope this helps
 
        
                    
             
        
        
        
Answer:
Converse
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
a) In 1.2 seconds, sound will travel a distance of ...
   (1.2 s)(340 m/s) = 408 m
This is the round-trip distance, so the reflecting surface is half that distance away.
The other side of the canyon is 204 m away.
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b) In 5 seconds, the sound will travel a distance of ...
   (5 s)(340 m/s) = 1700 m
This is the one-way distance, so the lightning is about 1700 m away.