Answer:
a=-20
Step-by-step explanation:
-4(7a+5)=-160
7a+(-20)=-160 Multiply -4 and 5
7a=-140 Subtract -20 from -160
a=-20 Divide 7 by -140
 
        
             
        
        
        
I want to say the third option but dont trust my opinion
        
                    
             
        
        
        
Answer:
<h2>At noon the tide will be at the lowest point which is 1 ft                                        </h2>
Step-by-step explanation:
please see attached a sketch of the solution for your reference
What is a sinusoidal wave?
Alternatively called a sine wave is a type of wave that shows a repetitive pattern or oscillation, it normally starts from a low point moves to the next point which is usually higher than the previous and repeats itself as the whole process continues