The surface area of what?
the larger triangle has angles of 75° and 55°.
the smaller triangle has angles of 75° and 55°.
the triangles are similar by AA.

Answer:
B. -1
Step-by-step explanation:
STEP 1: Simplify 3x+2(x−9).

STEP 2: Add 8x and x.

STEP 3: Move all terms containing x to the left side of the equation.

STEP 3: Move all terms not containing x to the right side of the equation.

STEP 4: Divide each term by −4 and simplify.
