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3241004551 [841]
2 years ago
11

2- Marcela deseja comemorar seu aniversário com uma festa e para isso pesquisou preços de duas empresas especializadas. A empres

a "Feliz Aniversário" cobra uma taxa fixa de R$ 200,00 e mais R$ 20,00 por convidado, enquanto a empresa "Parabéns a Você" cobra uma taxa fixa de R$ 100,00 e R$ 25,00 por convidado. Para que os preços oferecidos pela empresa "Feliz Aniversário" sejam mais vantajosos para Marcela, o número de convidados para sua festa de ser
a) maior que 20
b) menor que 20
c) menor ou igual a 20
d) maior ou igual a 20​
Mathematics
1 answer:
anygoal [31]2 years ago
4 0
Mdmdmdmksksksksksmsksksms
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PLEASE HELP WILL MARK THE BRAINLIEST
zhuklara [117]
1. Quadratic equations have the highest degree of 2. Therefore, the maximum amount of solutions can be 2 or unreal. The graphs with 2 solutions would cross over the x-axis twice, 1 solution would touch the x-axis once and 0 solutions would not touch the x-axis.

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5 0
3 years ago
6 divided by 2 (1+2)
user100 [1]
Observe. 

6/2(1+2)
6/2(3)
6/6
1

Thus, the answer is: 1

4 0
3 years ago
Read 2 more answers
What is the area of a triangle with vertices (3,0) (9,0) (7,6)
Nezavi [6.7K]

Answer:

The area of the triangle is of 21 units of area.

Step-by-step explanation:

The area of a triangle with three vertices (x_1,y_1),(x_2,y_2),(x_3,y_3) is given by the determinant of the following matrix:

A = \pm 0.5 \left|\begin{array}{ccc}x_1&y_1&1\\x_2&y_2&1\\1_3&y_3&1\end{array}\right|

In this question:

Vertices (3,0) (9,0) (7,6). So

A = \pm 0.5 \left|\begin{array}{ccc}3&0&1\\9&0&1\\7&7&1\end{array}\right|

A = \pm 0.5(3*0*1+0*1*7+1*9*7-0*7*1-0*9*1-3*1*7)

A = \pm 0.5*(63-21)

A = \pm 0.5*42 = 21

The area of the triangle is of 21 units of area.

5 0
2 years ago
PLEASE HELP ME!!!!
Sindrei [870]

Answer:

The current intervals for the bins are too wide. Looking at the histogram, it is difficult to draw useful conclusions about the fuel efficiency of the trucks or to see the shape of the data distribution.

Step-by-step explanation:

Here is the Plato answer

6 0
3 years ago
Read 2 more answers
A statistics tutor wants to assess whether her remedial tutoring has been effective for her five students. She decides to conduc
Snezhnost [94]

Answer:

The test statistic value is, <em>t</em> = -5.245.

The effect size using estimated Cohen's d is 2.35.

Step-by-step explanation:

A paired <em>t</em>-test would be used to determine whether the remedial tutoring has been effective for the statistics tutor's five students.

The hypothesis can be defined as follows:

<em>H</em>₀: The remedial tutoring has not been effective, i.e. <em>d</em> = 0.

<em>Hₐ</em>: The remedial tutoring has been effective, i.e. <em>d</em> > 0.

Use Excel to perform the Paired <em>t</em> test.

Go to Data → Data Analysis → t-test: Paired Two Sample Means

A dialog box will open.

Select the values of the variables accordingly.

The Excel output is attached below.

The test statistic value is, <em>t</em> = -5.245.

Compute the effect size using estimated Cohen's d as follows:

\text{Cohen's d}=\frac{Mean_{d}}{SD_{d}}

                =\frac{0.54}{0.23022}\\\\=2.34558\\\\\approx 2.35

Thus, the effect size using estimated Cohen's d is 2.35.

8 0
3 years ago
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