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Elodia [21]
3 years ago
6

In ΔQRS, the measure of ∠S=90°, RS = 2.2 feet, and QR = 4.5 feet. Find the measure of ∠Q to the nearest tenth of a degree.

Mathematics
1 answer:
Dmitriy789 [7]3 years ago
7 0

Answer:

Q = 29.3^\circ

Step-by-step explanation:

Given

\angle S = 90

RS = 2.2ft

QR = 4.5ft

See attachment for ΔQRS

To calculate <Q, we make use of:

sin\ Q = \frac{Opposite}{Hypotenuse}

Where

Opposite = RS

Hypotenuse = QR

sin\ Q = \frac{RS}{QR}

sin\ Q = \frac{2.2}{4.5}

sin\ Q = 0.4889

Take arc sin of both side

Q = sin^{-1}(0.4889)

Q = 29.3^\circ

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The factors of the quadratic expression x² - 4x - 21 is <u>(x - 7)(x + 3)</u>, making the <u>first option</u> the right choice.

A quadratic expression is of the form ax² + bx + c, which can be factorized using the mid-term factorization method, where b is shown as the sum or difference of two such numbers, whose product is equal to the product of a and c.

In the question, we are asked to factorize the quadratic expression, x² - 4x - 21.

In the given expression, a = 1, b = -4, and c = -21.

Thus, ac = -21.

The numbers having a product 21 are:

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Since, 3 - 7 = -4 (That is b), we break b into 3 and -7.

Thus, the expression can now be shown as:

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= x(x + 3) - 7(x + 3) {By taking common}

= (x - 7)(x + 3) {By taking common}.

Thus, the factors of the quadratic expression x² - 4x - 21 is <u>(x - 7)(x + 3)</u>, making the <u>first option</u> the right choice.

Learn more about factorizing a quadratic expression at

brainly.com/question/52959

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