Speed of pulley A = 600 r. p.m. Speed of pulleys B and C = ? r. p.m.

Speed of pulley D = ? r. p.m.

a. the residual plot for model 1 has a random pattern and is a good fit for the data.

answer: for each 3 girls there is 2 boys . 3: 2

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it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: