Are two planes perpendicular to a third plane parallel to each other? A. Always
B. Sometimes
C. Never

On my first go of answering this question, I immediately thought the answer was A, however, this turned out to be incorrect. Explanation needed! Thanks :)

No.

Step-by-step explanation:

Of course not. Place a hardback book standing up on your desktop and open the two hard covers to some arbitrary angle. The planes of the covers are each perpendicular to the desk top, but not parallel to each other (or necessarily perpendicular to each other).

hope it helps

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11.2

step-by-step explanation:

when doing tangent the tangent of the angle is equal to the opposite side from the angle over the adjacent side to the angle.

tan43 = x / 12

move 12 over by multiplying each side by 12

12tan43 = x

x = about 11.2

f(x)=4

step-by-step explanation: