Hello:
3x²+5x+2=0
delta = (5)²-4(3)(2)=1
x =( -5 <span>±1)/6
x= -2/3 or x=-1
t4-81=(t²)² -9² = (t²-9)(t²+9) =(t-3)(t+3)(t²+9)....(answer B)</span>
        
             
        
        
        
Answer:
A) 147.6 sq m
Step-by-step explanation:
Separate the pyramided out into 4 triangles and add those
3 of them (sides) will be the same

This is one half of the side, multiply by 2 to get the area of the entire side, 40 square m.
The area of all 3 sides together is 40*3 = 120 sq m
For your base, your height will be 6.9 and your base is 4
A = 13.8  sq m
multiply by 2 again for the entire base
A=27.6 sq m
Now add both
120 + 27.6
 
        
             
        
        
        
You start off, 
16 x 2 = 32
You're looking for x so,
49 - 32 = 17
Hope this helps :)!
Brainliest please