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4 years ago

Complete the solution of the equation. Find the value of y when x equals -9

Mathematics

1 answer:

vredina [299]4 years ago

4 0

Answer:

-3

Step-by-step explanation:

x=-9

-7(-9) +8y =39

63+8y=39

-63 -63

8y=-24

8y/8 = -24/8

y= -3

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alekssr [168]

Answer: $30^{\circ}$

Step-by-step explanation:

Given

$\sin 60=\dfrac{\sqrt{3}}{2}$

For

$\cos \theta =\dfrac{\sqrt{3}}{2}$

It indicates $\theta$ lies in I st quadrant. The value of cosine $30^{\circ}$ is equal to $\dfrac{\sqrt{3}}{2}$

Therefore, $\theta$ must be $30^{\circ}$

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3 years ago

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tamaranim1 [39]

Answer:

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Step-by-step explanation:

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3 years ago

Solve for x: 2/7 (x-2) =4c

shutvik [7]

Answer:

x=14c+2

Step-by-step explanation:

$\frac{2}{7} (x-2)=4c \\\frac{2}{7}x-\frac{4}{7} =4c\\\frac{2}{7}x=4c+\frac{4}{7}\\\frac{2}{7}x= \frac{28c+4}{7} \\2x=28c+4\\x=14c+2$

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3 years ago

Find the circumferences of the two circles circle a has a radius of 21 meters and circle b has a radius of 28 meters Is the rela

Feliz [49]

Answer:

The circumference for circle a is $\\ C = 131.9430$ m.

The circumference for circle b is $\\ C = 175.9240$ m.

The relationship between the radius of a circle and the circumference (the distance around the circle) is constant and is the same for all circles and can be written as $\\ \frac{C}{r} = 2\pi$ or, in a less familiar form, $\\ \frac{r}{C} = \frac{1}{2\pi}$ . The number $\\ \pi$ is constant for all circles and has infinite digits, $\\ \pi = 3.14159265358979....$ .

Step-by-step explanation:

The circumference of a circle is given by:

$\\ C = 2*\pi*r$ [1]

Where

$\\ C$ is the circle's circumference.

$\\ r$ is the radius of the circle.

And

$\\ \pi = 3.141592....$ is a constant value (explained below)

We can say that the distance around the circle is the circle's circumference.

The circumferences of the two circles given are:

Circle a, with radius equals to 21 meters ( $\\ r = 21m$ ).

Using [1], using four decimals for $\\ \pi$ , we have:

$\\ C = 2*\pi*r$

$\\ C = 2*3.1415*21$ m

$\\ C = 131.9430$ m

Then, the circumference for circle a is $\\ C = 131.9430$ m.

Circle b, with radius equals to 28 meters ( $\\ r = 28m$ ).

$\\ C = 2*3.1415*28$ m

$\\ C = 175.9240$ m

And, the circumference for circle b is $\\ C = 175.9240$ m.

We know that

$\\ 2r = D$

That is, the diameter of the circle is twice its radius.

Then, if we take the distance around the circle and we divided it by $\\ 2r$

$\\ \frac{C}{2r} = \frac{C}{D} = \pi$

This ratio, that is, the relationship between the distance around the circle (circumference) and the diameter of a circle is $\\ \pi$ and is constant for all circles. This result is called the $\\ \pi$ number, which is, approximately, $\\ \pi = 3.141592653589793238....$ (it has infinite number of digits).