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4 years ago

How to answer these questions?

Mathematics

1 answer:

MariettaO [177]4 years ago

7 0

I think you put each set of data in to l1 and l2 on your calculator nd find the linear regression ( r value) and you can get to the r value by going to stat diagnostic on

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Use the completing the square method to find the roots of 2x^2+3x-15=13 include the steps, it would be greatly appreciated thank

Monica [59]

Answer:

The roots are

$x1= \frac{-3+\sqrt{233}}{4}$

$x2= \frac{-3-\sqrt{233}}{4}$

Step-by-step explanation:

we have

$2x^{2}+3x-15=13$

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$2x^{2}+3x=13+15$

$2x^{2}+3x=28$

Factor the leading coefficient

$2(x^{2}+(3/2)x)=28$

Complete the square. Remember to balance the equation by adding the same constants to each side

$2(x^{2}+(3/2)x+(9/16))=28+(9/8)$

$2(x^{2}+(3/2)x+(9/16))=233/8$

$(x^{2}+(3/2)x+(9/16))=233/16$

Rewrite as perfect squares

$(x+(3/4))^{2}=233/16$

square root both sides

$(x+\frac{3}{4})=(+/-)\sqrt{\frac{233}{16}}\\ \\(x+\frac{3}{4})=(+/-)\frac{\sqrt{233}}{4}\\ \\x= -\frac{3}{4}(+/-)\frac{\sqrt{233}}{4}$

$x1= -\frac{3}{4}(+)\frac{\sqrt{233}}{4}=\frac{-3+\sqrt{233}}{4}$

$x2= -\frac{3}{4}(-)\frac{\sqrt{233}}{4}=\frac{-3-\sqrt{233}}{4}$

7 0

3 years ago

Abigail made a scale drawing of a campground. The scale of the drawing was 2 inches : 1 yard. The actual length of the picnic ar

Svet_ta [14]

Answer:

218

Step-by-step explanation:

8 0

3 years ago

Solve the following for the variable for 180-x=3(90-x)

lara31 [8.8K]

X = 45 is the answer
180-x = 3(90-x)
=> 180-x = 270 - 3x
=> -x+3x = 270-180
=> 2x = 90
=> x = 90/2
=> x = 45
Please mark brainliest.
Have good day :)

6 0

3 years ago

1. EL precio a la venta de una impresora de inyección de tinta es de $285.000 incluida una Ganancia del 35%. ¿cuánto le cuesta a

yuradex [85]

Excluyendo el componente de ganancia del coste para el consumidor según (1), la impresora tuvo un coste de $ 211.111,11 para el vendedor.

<h3>¿Cómo encontrar el precio de una impresora sin ganancia?</h3>

En el enunciado tenemos el precio de una impresora para el consumidor, el cual comprende el dinero invertido por vendedor más la ganancia <em>esperada</em>. Este indicador observa la siguiente fórmula:

C' = C · (1 + r/100) (1)

Donde:

C - Coste asumido por el vendedor, en unidades monetarias.
C' - Coste para el consumidor, en unidades monetarias.
r - Tasa de ganancia, en porcentaje.

Si sabemos que C' = $ 285.000 y r = 35 %, entonces el coste asumido por el vendedor es:

285.000 = 1,35 · C'

C' ≈ 211.111,11

Excluyendo el componente de ganancia del coste para el consumidor según (1), la impresora tuvo un coste de $ 211.111,11 para el vendedor.

Para aprender más sobre ganancias: brainly.com/question/8421949

#SPJ1

4 0

2 years ago

Six pounds of chocolate is split evebly among a group. If each person recives 1/2 pound of chocolate, how many people are in the

ruslelena [56]

Answer:

12 people

Step-by-step explanation:

If each person gets 1/2 pound of chocolate and there are 6 pounds then there are 12 people in the group.

3 0

4 years ago