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3 years ago

Find the value of X

Mathematics

1 answer:

SVEN [57.7K]3 years ago

3 0

First, we should figure out an equation and take note that we are dealing with complementary angles (angles that add up to 90 degrees)

Your equation:
(2x + 1) + (x - 7) = 90

Now solve!
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SOLVING...

(2x + 1) + (x - 7) = 90

Simplify and combine like terms
2x + 1 + x −7 = 90
2x + 1 + x + −7 = 90
(2x + x) + (1 + −7) = 90
3x + −6 = 90

Add 6 to each side
3x − 6 + 6 = 90 + 6
3x = 96

Divide each side by 3
3x ÷ 3 = 96 ÷ 3
x = 32

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Answer:

Step-by-step explanation:

Si cuentas desde el once hasta el espacio entre A y B llegas hasta 5. Entonces el número que está en ese espacio es 11.05

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3 years ago

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In order to solve the system of linear equations, the coefficients of one of the variables must be the same number but opposite

Mashutka [201]

Answer:

Step-by-step explanation:

because both equations do not have matching numbers for the x or y variable, and both equations are positive you are going to have to multiply each equation by a number so that there will be at least one variable with the same number but with opposite signs.

it does not matter which variable you choose.

lets use y because 2 and 3 are smaller then 2 and 5.

so lets multiply the first equation by 2 in order to get y equal to 6.

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(do not forget to multiply what the equation is equal to also)

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now for the second equation we need y to equal negative 6

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-15x-6y=-12

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4x+6y=12

-15x-6y=-12

-11x=0

x=0

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3 years ago

Which of the following are identities?

podryga [215]

Answer:

A. III only

Step-by-step explanation:

In mathematics, an identity is one of the characteristics of algebraic expressions.

Given variable a and b in an algebraic expression, an identity is defined as an equality that remains the same no matter the values that we choose for either variable a or b.

Identity in mathematics makes it very easy to solve algebraic expressions. The two sides of an identity in an algebra can easily be exchanged for each other.

In the above question, we are given 3 Options.

I) 3(5 + 2x) = 15 + 6x

II) y = x + 3

III) (x² - y²) = (x + y) (x - y)

Option I) 3(5 + 2x) = 15 + 6x

Is showing distributive property in mathematics.

Distributive property is :

a(b + c) = ab + ac

Option I is not an identity , therefore it is wrong.

Option II) y = x + 3 is just an algebraic expression.

Only Option III is an identity. This is because it follows the rule of

(a² - b²) = (a + b) (a - b)

We can prove and confirm this be solving the algebraic expression

(x + y) (x - y)

We expand the bracket

x² - xy +xy - y²

x² - y²

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4 years ago

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WITCHER [35]

Answer:

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Part 2) $P=6(\pi+2\sqrt{2})\ cm$

Step-by-step explanation:

The picture of the question in the attached figure

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we know that

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Answer:

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This can be "simplified" to ...

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