The number of positive roots is the number of changes of signs there are, then decrease by 2 each time and stop when you get to 1 or 0
negative roots, sub every x with -x and reevaluate, count change of signs
decrease by 2 each time and stop when you get to 1 or 0
y=+2x⁵-x⁴-2x³+4x²+x-2
+,-,-,+,+,-
 1    2  3
3 or 1 positive roots
replace x with -x ( baically flip all signs of odd powerd numbers)
y=-2x⁵-x⁴+2x³+4x²-x-2
   -,-,+,+,-,-
     1    2
2 or 0 negative roots
3 or 1 positive roots
2 or 0 negative roots
2nd option is answer
        
             
        
        
        
a term will be the expression between the + or - signs

 
        
             
        
        
        
Answer: The answer to the first is -29x-5. The Answer to the second is -5/6a - 5/8
Step-by-step explanation:I took the K12 test I hope this helps.
 
        
             
        
        
        
        
Answer:
Step-by-step explanation:
Mass m=25 g
Volume V=1.29 cm³
density D=M/V
=25/1.29
≈19.38 
≈19 g/cm³