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3 years ago

13= -2(x+1) + 7x solve for x

Mathematics

2 answers:

NARA [144]3 years ago

7 0

Step-by-step explanation:

13=-2x-2+7x

15=5x

x=3

please mark it as brainliast

Veronika [31]3 years ago

4 0

Answer:

x=3

Step-by-step explanation:

13= -2 (x+1) +7x (given)

13+-2x - 2 +7x (distributive property of multiplication over addition)

13 + 5x -2 (combine like terms)

15 = 5x (addition property of equality)

3 = x (division property of equality)

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Factor completely 2x2 − 2x − 40

Montano1993 [528]

Answer:

2(x-5)(x+4)

Step-by-step explanation:

2x^2 − 2x − 40

Factor out a 2

2(x^2 -x -20)

What 2 numbers multiply to -20 and add to -1

-5*4 = -20

-5+4 = -1

2(x-5)(x+4)

4 0

2 years ago

Use l'Hôpital's Rule to find the following limit. ModifyingBelow lim With x right arrow 0StartFraction 3 sine (x )minus 3 x Ove

steposvetlana [31]

Answer:

$\lim_{x \to 0} \frac{3sinx-3x}{7x^3}=-\frac{1}{14}$

Step-by-step explanation:

The limit is:

$\lim_{x \to 0} \frac{3sinx-3x}{7x^3}=\frac{0}{0}$

so, you have an indeterminate result. By using the l'Hôpital's rule you have:

$\lim_{x \to 0} \frac{a(x)}{b(x)}= \lim_{x \to 0} \frac{a'(x)}{b'(x)}$

by replacing, and applying repeatedly you obtain:

$\lim_{x \to 0} \frac{3sinx-3x}{7x^3}= \lim_{x \to 0}\frac{3cosx-3}{21x^2}= \lim_{x \to 0}\frac{-3sinx}{42x}= \lim_{x \to 0}\frac{-3cosx}{42}\\\\ \lim_{x \to 0} \frac{3sinx-3x}{7x^3}=\frac{-3cos0}{42}=-\frac{1}{14}$

hence, the limit of the function is -1/14

8 0

2 years ago

20 points math test

qwelly [4]

Answer:

Step-by-step explanation:

A negative times a positive is a negative

6 0

2 years ago

El sueldo de un padre de familia es de $4,500. ¿Cuánto es su sueldo si le aumentan un 4%?

lesya [120]

Answer:

el nuevo salario es 4680

Step-by-step explanation:

Dado

Salario = 4.500

Incremento = 4%

Necesario

Determinar el nuevo salario

El nuevo salario se calcula utilizando lo siguiente:

Nuevo salario = salario anterior + 4% * salario anterior

Nuevo salario = 4500 + 4% * 4500

Nuevo salario = 4500 + 180

Nuevo salario = 4680

Por lo tanto, el nuevo salario es 4680

6 0

2 years ago

What is the height of a triangle that has an area of 24 in.2 and a base with a length of 8 in.?

mylen [45]

Answer:⬇️⬇️⬇️⬇️

Step-by-step explanation: Area of a triangle = ½base times height⇒ A = ½bh

Given that the area is 24 and the base is 8, we would have this equation

24 = ½(8)h

24 = 4h divide both sides by 4

6 = h So the height of the triangle is 6 feet

CHECK

A = ½bh

24 = ½(8)(6)

24 = 4(6)

24 = 24√

8 0

2 years ago