In the right triangle, one of the angles has measure 60 deg, so the remaining angle has measure 30 deg. In such a 30-60-90 triangle, the sides occur in a ratio of 1 to to 2 (shorter leg to longer leg to hypotenuse). This means
making the answer C.
1.
(-4a^3)^3*a^4
=-4^3*a^9*a^4
=-64*a^13
2.
6=12/2
3=6/2
1.5=3/3
The next term is 1.5.
Good luck!
If your asking if those lengths would form a triangle... then they won’t because if the two shortest side don’t add up to be larger then the largest side then they won’t make a triangle