Answer:
Below.
Step-by-step explanation:
a) An equilibrium does have rotational symmetry.
The angle of rotation is 120 degrees .
It has Rotational symmetry of order 3.
b) It does tessellate because the angle in the triangle divides exactly into 360 : 360 / 60 = 6.
Answer: x^2-5x-84
Step-by-step explanation:
(x+7)(x-12)=
x*x+(-12*x)+7x+(-84)=
x^2-12x+7x-84=x^2-5x-84
A = 1.5b
Have a great day!