Fast plz and you : d solve for x.

2x^2=72

−6 and 6
−8 and 8
−18 and 18
−36 and 36

What expression is equivalent to 42x-56y

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?