90. Add the zero in front of the 9.
        
             
        
        
        
Where are the answer choices ?
        
             
        
        
        
Answer:
c
Step-by-step explanation:
because it is the most reasonable answer
 
        
             
        
        
        
The answer is 72.17 using the formula for a square pyramid
        
             
        
        
        
Answer: the list of roots is {-4, 2, -3+2i, -3-2i}
Use the quadratic formula to get the roots of the two separate terms in brackets:
x^2+6x+8=0 has solutions: -4 and 2
x^2+6x+13=0 has solutions: -3+2i and -3-2i