3 years ago

Use substitution to solve the system.

Mathematics

1 answer:

Andrews [41]3 years ago

3 0

Answer:

its ( 3,5) Equation form is: x = 3 , y = 5

Step-by-step explanation:

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The ratio of the measure of two supplementary angles is 15:21. What is the measure of the smallest angle?

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Answer:

Step-by-step explanation:

The measure of two supplementary angles = 15:21

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4 years ago

Victoria went shopping for ingredients to make a stew.The table shows the weight and cost of each of the ingredients that she bo

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Answer:

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3 years ago

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Step-by-step explanation:

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Find the exact value of cos 120° in simplest form with a rational<br> denominator.

IRINA_888 [86]

Given:

cos 120°

To find:

The exact value of cos 120° in simplest form with a rational denominator.

Solution:

We have,

$\cos 120^\circ$

It can be written as

$\cos 120^\circ=\cos (90^\circ+30^\circ)$

$\cos 120^\circ=-\sin 30^\circ$ $[\because \cos (90^\circ-\theta)=-\sin \theta]$

$\cos 120^\circ=-\left(\dfrac{1}{2}\right)$ $[\because \sin 30^\circ=\dfrac{1}{2}]$

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