Arecipe calls for 3 cups of milk to accommodate 8 people. however, you are preparing food for 20 people. what are the number of cups of milk you will need for 20 people? use a proportion to solve.

The original recipe is 3 cups for 8 people, which can be written as a proportion of 3/8

You want to make enough for 20 people, let X be the number of cups required, so the proportion for this would be x/20.

Now you have two proportions, set them to equal:

3/8 = x/20

Cross multiply:

(3*20) = (8*x)

Simplify"

60=8x

Divide both sides by 8:

x = 60/8

x = 7.5

You will need 7.5 cups ( 7 1/2 as a fraction)

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:

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