to find the sum:
2(3t-4) - (t^2 + 2) - 4t(t-1)
6t - 8 - t^2 - 2 - 4t^2 + 4
6t - 8 - 5t^2 + 2
-5t^2 + 6t - 6
by the sum of roots and product of roots formulae
ax^2 + bx + c
x + y = 
x + y = 
xy = 
xy = 
x - y =
The last one
solid particles bump into each other
Is 172 the area or perimeter.
Answer is in the attached figure.
65.9 yo. 5 and above give it a shove 4 and beliw let it go