1) miss kelley and mr. peabody have 25 and 36 children in their classrooms, respectively.
the ratio of boys to girls in miss kelley's classroom is 3: 2 and the ratio of girls to all the
children in mr. peabody's classroom is 1: 3. if the two classes are combined, what is the
ratio of girls to boys?

2) an item was marked up 25% and then this price was marked down 20%. what is the net
effect of these two markings?

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.

fyuh

step-by-step explanation:

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