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3 years ago

Solve this equation 5x-7=-12

Mathematics

2 answers:

cupoosta [38]3 years ago

7 0

Answer:

5x - 7= -12

5x - 7+7 = -12+ 7

5x= -5

x= -1

Step-by-step explanation:

hope this helped

Tasya [4]3 years ago

4 0

Answer:

x = -1

Step-by-step explanation:

Isolate the variable by adding 7 on both sides. 5x-7+7 is 5x, and -12+7 is -5. Then, you get the equation 5x = -5. You have to then divide by 5 on both sides. 5x/5 is x and -5/5 is -1. You would then get that x = -1.

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In a parallel circuit, ET = 240 V, R = 330 Ω, and XL = 420 Ω. What is Z?

denis-greek [22]

Answer:

Z = 258Ω

Step-by-step explanation:

There are two methods of solving this question,

First method

Z = ( RXL)/ sqr rt ( R²+XL²)

Z= (330 Ω × 420 Ω)/ sqr rt ( 330 Ω² + 420 Ω²)

Z = 138600 Ω /534

Z = 259 Ω

THE second complete method is given in attachment below

6 0

3 years ago

Neelam is pouring sand into a clear box to make sand art. The box is a right rectangular prism, and the base of the box is 7 in.

Marrrta [24]

Answer:20 2/4

Step-by-step explanation:

7 0

2 years ago

What is the slope of the line that passes through the points (-2, -1)

Lera25 [3.4K]

Plug this into the formula y2 - y1 / x2 - x1

-2 = x1, x2 = 2, y1 = -1, y2 = -3

-3 - (-1) / 2 - (-2)

-2 / 4

-1/2

The slope is -1/2.

4 0

3 years ago

The points -5,2 and -5,8 lie on a circle with a radius of 3. Find the center of the circle.

worty [1.4K]

The formula of a distance between two points:

$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

We have two points A(-5, 2) and B(-5, 8). Substitute:

$d=\sqrt{(8-2)^2+(-5-(-5))^2}=\sqrt{6^2+0^2}=\sqrt{6^2}=6$

d is a diameter of a circle because d = 2r = 2(3).

The center of a circle is in midpoint of AB.

The formula of a midpoint:

$M\left(\dfrac{x_1+x_2}{2},\ \dfrac{y_1+y_2}{2}\right)$

Substitute:

$\dfrac{-5+(-5)}{2}=\dfrac{-10}{2}=-5\\\\\dfrac{2+8}{2}=\dfrac{10}{2}=5$

Answer: (-5, 5).

6 0

3 years ago

I need the answers pls!!!! please

Igoryamba

Answer:

$(4x - 3)(5x - 8) = 20x^2 -47x + 24$

Step-by-step explanation:

Given

$(4x - 3)(5x - 8)$

Required

Identify and correct error

The error is when the inner and outer terms are multiplied. i.e.

$4x * -8 = -32x$ not 32x

$-3 * 5x = -15x$ not 15x

So, the expression is:

$(4x - 3)(5x - 8) = 20x^2 - 32x -15x + 24$

$(4x - 3)(5x - 8) = 20x^2 -47x + 24$

6 0

3 years ago