A slot machine at a casino pays the player a jackpot if 7 symbols out of 9 possible symbols match in the correct order on the screen. How many ways can a player trigger a jackpot payment? First, we will decide if this is a permutation or combination problem. Select the two options below that indicate which type of problem this is.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

y = x + 95

y = 42 + 95

y=137 mm hg