Im having a brain fart moment rn. Does f(27) mean to replace the x with 27 or f(x) with 27

You so much whoever answers with accuracy •the parent function of the graph of f(x) is the square root function, which was reflected across the x-axis. which of the following is the equation of f(x)?

Which polynomial is in standard form? 3xy+6x®y2 - 4x4y + 19x? y* 18x5 - 7x{y-2xy2 + 1774 x5y5 - 3xy - 11x? y2 +12 15+ 12xy2 - 11x®ys +5x? y2 ?

Acontainer full of water weighs 15.5 lbs. when ¼ of the water is poured out, the container now weighs 12 ½ lbs. how much does the container weigh when empty?