Mavis is n years old if Sey is three times as old as Mavis. write an expression for Sey's present age. If Mavis age and Sey's age equals 12, find Mavis age ​

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.

sites:

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step-by-step explanation: