Lisa lives in atlanta. she is going to a baseball game with her two sisters and her parents. they have $100 to spend. after they buy their tickets, how much money will they have left to buy refreshments?

Not enough information. How much do the tickets cost?

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.

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step-by-step explanation: