Simplify 2x(x-3)-2(-x-1)

Pls explain your answers. thanks.

Rewrite the hyperbolic equation 4y^2 -9x^2 +54x-8y-113=0

Which best explains why this triangle is or is not a right triangle?

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°