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Gre4nikov [31]
2 years ago
10

Which is a correct first step in solving the inequality –4(2x – 1) > 5 – 3x?distribute –4 to get –8x 4 > 5 – 3x.distribute

–4 to get –8x – 1 > 5 – 3x.subtract 2x from both sides of the inequality.add 1 to both sides of the inequality.
Mathematics
2 answers:
Leviafan [203]2 years ago
9 0

Answer:

Option A is correct.

The first step in solving the inequality is:

to distribute -4 to get  -8x + 4> 5-3x

Step-by-step explanation:

The distributive property says that:

a\cdot(b+c) =a\cdot b + a\cdot c

Given the inequality:

-4(2x-1)> 5-3x

Apply the distributive property we have;

-4 \cdot (2x) -4\cdot (-1)> 5-3x

Simplify:

-8x + 4> 5-3x

Therefore, the first step in solving the inequality is:

to distribute -4 to get  -8x + 4> 5-3x

OLga [1]2 years ago
8 0

Distribute –4 to get –8x + 4 > 5 – 3x.

<h3>Further explanation</h3>

The inequality –4(2x – 1) > 5 – 3x.

We will solve the problem of inequality of one variable. Here are the steps:

<u>Step-1:</u> Distribute –4 to get –8x + 4 > 5 – 3x.

–4(2x – 1) > 5 – 3x

-4(2x) + (-4)(-1) > 5 – 3x

-8x + 4 > 5 – 3x

Therefore, a correct first step in solving the inequality: Distribute –4 to get –8x + 4 > 5 – 3x.

<u>Step-2:</u> Subtract 4 from both sides of the inequality

-8x + 4 - 4 > 5 - 4 – 3x

-8x > 1 – 3x

<u>Step-3:</u> Add 3x from both sides of the inequality

-8x + 3x > 1 – 3x + 3x

-5x > 1

<u>Step-4:</u> Divide -5 from both sides of the inequality

\boxed{ \ \frac{-5x}{-5} > \frac{1}{-5} \ }

Thus, the solution is  \boxed{\boxed{ \ x < -\frac{1}{5} \ }}

- - - - - - - - - -

Notes:

  • The Distributive Property:  \boxed{ \ A(B + C) = A \cdot B + A \cdot C \ } or \boxed{ \ A(B - C) = A \cdot B - A \cdot C \ }
  • If inequality is multiplied or divided by a negative number, then the sign of the inequality changes.
<h3>Learn more</h3>
  1. Which of the following is the correct graph of the solution to the inequality −8 greater than or equal to −5x + 2 > −38?  brainly.com/question/1626676  
  2. Which is the graph of 2x – 4y > 6 brainly.com/question/4408289#
  3. Which table represents a linear function brainly.com/question/10570936

Keywords: a correct first step, in solving the inequality, one variable, distribute, add, subtract, divide, multiply, sign, minus, negative, solution, distributive property

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Answer: One fourth of the entire trip.

Step-by-step explanation:

The initial distance is D.

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So he wakes up when his actual position is a fourth of the initial distance:

(D/2)/2 = D/4.

Then if the entire trip has a distance D, and he was sleeping between:

D/2 - D/4 = 2D/4 - D/4 = D/4.

in a trip of a distance D, he was asleep a distance of D/4.

Then, returning to the question:

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This is equal to the quotient between the distance that he travels asleep and the total distance:

r = (D/4)/D = 1/4.

Then he was asleep in 1/4 of the entire trip.

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2 years ago
If r=[x,y,z] and r0=[x0,y0,z0], describe the set of all points (x,y,z) such that Ir-r0I =1.
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Answer:

The points (x,y,z) that respond to Ir-r0I =1, are all that describes the form (x-x_0)^2+(y-y_0)^2+(z-z_0)^2=1 with:

-1+x₀<x<1+x₀

-1+y₀<y<1+y₀

-1+z₀<z<1+z₀

Step-by-step explanation:

All points required in this problem came from applying the definition of modulus of a vector:

Ir-r0I =1.

|(x,y,z)-(x_{0},y_{0},z_{0})|=|(x-x_{0},y-y_{0},z-z_{0})|=\sqrt{(x-x_{0})^2+(y-y_{0})^2+(z-z_{0})^2}=1\\(x-x_{0})^2+(y-y_{0})^2+(z-z_{0})^2=1^2=1

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2 years ago
The relationship between money earned and hours worked is linear. Joe computes the slope between (4, 30) and (12, 90), then comp
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Finding the slope of both coordinates, you'll get 15/2. The slopes are the same 
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2 years ago
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g An irate student complained that the cost of textbooks was too high. He randomly surveyed 36 other students and found that the
blagie [28]

Answer:

A 90% confidence interval of the true mean is [$119.86, $123.34].

Step-by-step explanation:

We are given that an irate student complained that the cost of textbooks was too high. He randomly surveyed 36 other students and found that the mean amount of money spent on textbooks was $121.60.

Also, the standard deviation of the population was $6.36.

Firstly, the pivotal quantity for finding the confidence interval for the population mean is given by;

                              P.Q.  =  \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }  ~ N(0,1)

where, \bar X = sample mean amount of money spent on textbooks = $121.60

            \sigma = population standard deviation = $6.36

            n = sample of students = 36

            \mu = population mean

<em>Here for constructing a 90% confidence interval we have used One-sample z-test statistics as we know about population standard deviation.</em>

<em />

So, 95% confidence interval for the population mean, \mu is ;

P(-1.645 < N(0,1) < 1.645) = 0.90  {As the critical value of z at 5% level

                                                      of significance are -1.645 & 1.645}  

P(-1.645 < \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } } < 1.645) = 0.90

P( -1.645 \times {\frac{\sigma}{\sqrt{n} } } < {\bar X-\mu} < 1.645 \times {\frac{\sigma}{\sqrt{n} } } ) = 0.90

P( \bar X-1.645 \times {\frac{\sigma}{\sqrt{n} } } < \mu < \bar X+1.645 \times {\frac{\sigma}{\sqrt{n} } } ) = 0.90

<u>90% confidence interval for</u> \mu = [ \bar X-1.645 \times {\frac{\sigma}{\sqrt{n} } } , \bar X+1.645 \times {\frac{\sigma}{\sqrt{n} } } ]

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                                      = [$119.86, $123.34]

Therefore, a 90% confidence interval of the true mean is [$119.86, $123.34].

5 0
2 years ago
A composite figure is comprised of a square, trapezoid, and a rectangle. The square has side lengths of 10 centimeters. The trap
Evgesh-ka [11]

The area of the composite figure is 264 square centimeters, if a composite figure comprised of a square, trapezoid and a rectangle.

Step-by-step explanation:

The given is,

                   Dimensions of square has length of 10 cm

                   Trapezoid has base lengths of 8 cm and 14 cm

                   The length of the trapezoid is 4 cm

                   Rectangle has side length of 20 cm and 6 cm

Step:1

            Area of composite figure = Area of square + Area of Trapezoid

                                                                + Area of rectangle.......................(1)

Step:2

                  Formula for area of square,

                                                 A_{square} = a^{2}

                 where, a - side of length = 10 cm

                                                             =10^{2}

                                                            =100

                    Area of square, A_{square} = 100 Square centimeter

Step:3

                Formula for area of Trapezoid,

                                            A_{Trapezoid} = \frac{a+b}{2} h.......................................(2)

                    Where, a - 8 cm

                                 b - 14 cm

                                 h - 4 cm

                 From equation (2)

                                                            = \frac{8+14}{2} 4

                                                            = (11)(4)

                                                            = 44

         Area of  Trapezoid, A_{Trapezoid} = 44 square centimeters

Step:4

             Formula for area of rectangle,

                                            A_{Rectangle} =lb......................................(3)

            Where, l = 20 cm

                        b = 6 cm

           Equation (3) becomes,

                                                            = (20)(6)

                                                            = 120

            Area of rectangle, A_{Rectangle} = 120 square centimeters

Step:5

            From Equation (1),

                     A_{Composite} = 100 + 44 + 120

                                     = 264 square centimeters

Result:

            The area of the composite figure is 264 square centimeters, if a composite figure comprised of a square, trapezoid and a rectangle.

4 0
2 years ago
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