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Dafna1 [17]
3 years ago
9

a data set consists of these points (2, -4), (4, -7), (5, -12), Elisa found the regression equation to be y = 2.5x + 1.5 is she

correct
Mathematics
1 answer:
allochka39001 [22]3 years ago
8 0

Answer:

Not correct.

Step-by-step explanation:

If we plug in the x values into the equation we don't get anyway near to the y-values:

x = 2, y = 2.5(2) + 1.5 = 6.5 - comp[are this with y = -4 of the point(2, -4).

when x = 4, y = 11.5 ( compared with -7) and

when x = 5, y = 14 (compared with  -12).

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A builder makes drainpipes that drop 1 cm over a
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Answer:

700.4 cm

Step-by-step explanation:

This involves two similar triangles.

Both triangles are right triangles.

One has legs measuring 1 cm and 30 cm. We can find the hypotenuse by using the Pythagorean theorem.

(1 cm)^2 + (30 cm)^2 = c^2

c^2 = 901 cm^2

c = sqrt(901) cm

The second triangle has one leg with length 700 cm. This leg corresponds to the 30-cm leg in the other triangle. Since the triangles are similar, we can use a proportion to find the hypotenuse of the second triangle.

(30 cm)/(700 cm) = [sqrt(901) cm]/x

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x = 70 * sqrt(901) cm/3

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Answer: 700.4 cm

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