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mr. yu applies 1/2 ounce of fertilizer to every 5/8 square meter of his lawn.
how many ounces of fertilizer does mr. yu use per square meter for his lawn?

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.

im pretty sure it would be 5 am, hope that , and give brainliest and guys if this is right then press the button and give 5 stars