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3 years ago

What is the answer to 5 3x + 12- 6x = -9

Mathematics

2 answers:

Dmitrij [34]3 years ago

8 0

Answer:

$x=7$

Step-by-step explanation:

Step-By-Step on how to solve it is in the attached picture below.

Hope this helps! :)

Katarina [22]3 years ago

6 0

Answer:

x=-21/47

Step-by-step explanation:

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Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. Th

denpristay [2]

Answer:

(1) Correct option is B.

(2) Correct option is C.

Step-by-step explanation:

The information provided is:

$n_{1}=200,\ \bar x_{1}=22.7,\ s_{1} = 4.5\\n_{2}=200,\ \bar x_{2}=19.7,\ s_{2} = 4.3$

The (1 - α)% confidence interval for the difference between two mean is:

$CI=\bar x_{1}-\bar x_{2}\pm t_{\alpha/2, (n_{1}+n_[2}-2}\sqrt{\frac{s_{1}^{2}}{n_{1}}+\frac{s_{2}^{2}}{n_{2}} }$

The critical value of t is:

$\alpha /2=0.05/2=0.025$

degrees of freedom $=n_{1}+n_{2}-2=200+200-2=398$

$t_{\alpha/2, n_{1}+n_{2}-2}=t_{0.025, 398}=1.96$

Compute the 95% confidence interval for the difference between two mean as follows:

$CI=22.7-19.7\pm 1.96\sqrt{\frac{4.5^{2}}{200}+\frac{4.3^{2}}{200} }\\=3\pm0.8624\\=(2.1376, 3.8624)\\\approx(2.14, 3.86)$

Thus, the 95% confidence interval, (2.14, 3.86) implies that the true mean difference value is contained in this interval with probability 0.95.

Correct option is B.

The null value of the difference between means is 0.

As the value 0 is not in the interval this implies that there is a difference between the two means, concluding that priming does have an effect on scores.

Correct option is C.

4 0

3 years ago

Simplify each expression. Use a slash () to show a fraction. Do not use any spaces. -(3)^2

I am Lyosha [343]

Answer:

The answer would be -9

Step-by-step explanation:

-(3)^2

-(9)

-9

Following order of operations (PEMDAS)

6 0

2 years ago

Find a area of a circumference that is 13 ft for 3.14 π

Elena-2011 [213]

Answer:

4.14x3.14=12.9996

Step-by-step explanation:

This is the closest to 13 ft via circumference

Here is a few equations a dn formulas to remind you.

Area=3.14xRxR or Pi*rr

This is Pi times the radius times the radius.

The radius is half of the circle or half of the Diameter.

Area(semi-circle)=1/2x3.14xrxr

Circumfrence=3.14xDor 3.14xdiameter

If this answer helped pls give brainlest.

8 0

2 years ago

Solve for x. M=5/dx+e

snow_lady [41]

After solving $M=\frac{5}{dx}+e$ we get value of x: $x=\frac{5}{(M-e)d}$

Step-by-step explanation:

We need to solve the equation $M=\frac{5}{dx}+e$ to find value of x

Solving

$M=\frac{5}{dx}+e$

Adding -e on both sides

$M-e=\frac{5}{dx}+e-e$

$M-e=\frac{5}{dx}$

Multiply both sides by dx

$dx(M-e)=5$

Divide both sides by M-e

$dx=\frac{5}{M-e}$

Divide both sides by d

$x=\frac{5}{(M-e)d}$

So, After solving $M=\frac{5}{dx}+e$ we get value of x: $x=\frac{5}{(M-e)d}$

Keywords: Solving Equations

Learn more about Solving Equations at:

#learnwithBrainly

8 0

3 years ago

The perimeter cf a rectangle i: 56 inches" the ratio of the length of the width is 6 : 1. Find the length and the width.

sergejj [24]

Answer: Length = 24; width =4

Step-by-step explanation

Since the ratio of the length to width is 6:1

Let the length be represented as 6x

And the width be = x

Such that that the Perimeter of the rectangle which is

Perimeter = 2(length + width) becomes

56 = 2(6x + x)

56/2 = 6x+x

28 = 7x

x = 4

Width = 4

Length = 6x= 6 x 4 = 24

8 0

2 years ago