3 years ago

PICTURE IS PROVIDED SO PLEASE LOOK AT IT AND THEN ANSWER

Mathematics

1 answer:

Karo-lina-s [1.5K]3 years ago

3 0

Answer:

43 square cm

Step-by-step explanation:

Hope that helps!

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3/28 of the animals are birds. 4/15 are birds of prey. What fraction of the animals are birds of prey.

vova2212 [387]

Let's call animals "a", and birds "b", birds of prey, "p"

so, b= $\frac{3}{28} a$

and p= $\frac{4}{15} b$
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we substitude b into the last one:

and p= $\frac{4}{15}* \frac{3}{28} a$
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p= $\frac{4*3}{15*28} a$

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which is the answer!

7 0

2 years ago

A rectangular field with perimeter of 80m is to have an area of at least 380m² . Describe the possible lengths and of the field.

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$let \: x \: be \: the \: length \\ let \: y \: be \: the \: width$

$perimeter = 2x + 2y \\ area = xy$

$2x + 2y = 80 \\ xy = 380 \\ \\ x + y = 40 \\ xy = 380 \\ \\ x = 40 - y \\ (40 - y)y = 380$

$40y - y {}^{2} = 380 \\ y {}^{2} - 40y + 380 = 0 \\ y {}^{2} - 40y + 400 = 20 \\ (y - 20) {}^{2} = 20 \\ y - 20 =± \sqrt{20} \\ y_{1}=20-√20≈15.52786\\ y_{2}=20+√20≈24.4721$

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