Using evidence from the sources and information from your chart, explain how people and animals make sounds.

The correct answer to this open question is the following.

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People and animals make sounds in order to communicate with each other. We mean, humans with humans and animals with animals of their species.

Different animals make different sounds. We as humans, speak.

Animal, for instance, birds, produce different sounds, depending on the species, because they have these organs, They have a bill, tongue, larynx, trachea, syrinx, and air sacks.

In the case of humans, we can speak because we have a mouth, leaps, tongue, oral cavity, pharynx, vocal cords, larynx, trachea, and lungs.

We and the animals need the air from the lunges to produce sounds through these organs.

x = 7

step-by-step explanation:

equating the expression for area to the given area

2x² - 7x - 4 = 45 ( subtract 45 from both sides )

2x² - 7x - 49 = 0 ← in standard form

to factor consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term

product = 2 × - 49 = - 98 and sum = - 7

the factors are - 14 and + 7

use these factors to split the middle term

2x² - 14x + 7x - 49 = 0 ( factor the first/second and third/fourth terms )

2x(x - 7) + 7(x - 7) = 0 ← factor out (x - 7)

(x - 7)(2x + 7) = 0

equate each factor to zero and solve for x

x - 7 = 0 ⇒ x = 7

2x + 7 = 0 ⇒ 2x = - 7 ⇒ x = -

thus the positive value for x is x = 7

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