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Marina CMI [18]

3 years ago

15

I really need help guys I'm so silly

\times 4" alt=" - 5 \times 4" align="absmiddle" class="latex-formula">

1 answer:

aksik [14]3 years ago

8 0

Answer:

-20

Step-by-step explanation:

First, you just have to take off the negative sign:

$5 \times 4$

Then, multiply:

$5 \times 4 = 20$

Lastly, put the negative sign back on the 20:

$-20$

That's your answer!

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A rectangular field is 300 meters long and 250 meters wide. What is the area of the field in square kilometers

lidiya [134]

Answer:

0.075 sq km

Step-by-step explanation:

Given that there is a rectangular field with dimensions of length =300 m and width = 250 m.

We have to calculate area of this rectangle in the units of square kilometres.

Let us convert length and width into km

1000m = 1 km

Hence length = 300/1000= 0.3 km and

width = 250/1000 = 0.25 km.

ARea = length x width = 0.3 x 0.25

=0.075 square km.

7 0

3 years ago

La potencia que se obtiene de elevar a un mismo exponente un numero racional y su opuesto es la misma verdadero o falso?

malfutka [58]

Answer:

Falso.

Step-by-step explanation:

Sea $d = \frac{a}{b}$ un número racional, donde $a, b \in \mathbb{R}$ y $b \neq 0$ , su opuesto es un número real $c = -\left(\frac{a}{b} \right)$ . En el caso de elevarse a un exponente dado, hay que comprobar cinco casos:

(a) <em>El exponente es cero.</em>

(b) <em>El exponente es un negativo impar.</em>

(c) <em>El exponente es un negativo par.</em>

(d) <em>El exponente es un positivo impar.</em>

(e) <em>El exponente es un positivo par.</em>

(a) El exponente es cero:

Toda potencia elevada a la cero es igual a uno. En consecuencia, $c = d = 1$ . La proposición es verdadera.

(b) El exponente es un negativo impar:

Considérese las siguientes expresiones:

$d' = d^{-n}$ y $c' = c^{-n}$

Al aplicar las definiciones anteriores y las operaciones del Álgebra de los números reales tenemos el siguiente desarrollo:

$d' = \left(\frac{a}{b} \right)^{-n}$ y $c' = \left[-\left(\frac{a}{b} \right)\right]^{-n}$

$d' = \left(\frac{a}{b} \right)^{(-1)\cdot n}$ y $c' = \left[(-1)\cdot \left(\frac{a}{b} \right)\right]^{(-1)\cdot n}$

$d' = \left[\left(\frac{a}{b} \right)^{-1}\right]^{n}$ y $c' = \left[(-1)^{-1}\cdot \left(\frac{a}{b} \right)^{-1}\right]^{n}$

$d' = \left(\frac{b}{a} \right)^{n}$ y $c = (-1)^{n}\cdot \left(\frac{b}{a} \right)^{n}$

$d' = \left(\frac{b}{a} \right)^{n}$ y $c' = \left[(-1)\cdot \left(\frac{b}{a} \right)\right]^{n}$

$d' = \left(\frac{b}{a} \right)^{n}$ y $c' = \left[-\left(\frac{b}{a} \right)\right]^{n}$

Si $n$ es impar, entonces:

$d' = \left(\frac{b}{a} \right)^{n}$ y $c' = - \left(\frac{b}{a} \right)^{n}$

Puesto que $d' \neq c'$ , la proposición es falsa.

(c) El exponente es un negativo par.

Si $n$ es par, entonces:

$d' = \left(\frac{b}{a} \right)^{n}$ y $c' = \left(\frac{b}{a} \right)^{n}$

Puesto que $d' = c'$ , la proposición es verdadera.

(d) El exponente es un positivo impar.

Considérese las siguientes expresiones:

$d' = d^{n}$ y $c' = c^{n}$

$d' = \left(\frac{a}{b}\right)^{n}$ y $c' = \left[-\left(\frac{a}{b} \right)\right]^{n}$

$d' = \left(\frac{a}{b} \right)^{n}$ y $c' = \left[(-1)\cdot \left(\frac{a}{b} \right)\right]^{n}$

$d' = \left(\frac{a}{b} \right)^{n}$ y $c' = (-1)^{n}\cdot \left(\frac{a}{b} \right)^{n}$

Si $n$ es impar, entonces:

$d' = \left(\frac{a}{b} \right)^{n}$ y $c' = - \left(\frac{a}{b} \right)^{n}$

(e) El exponente es un positivo par.

Considérese las siguientes expresiones:

$d' = \left(\frac{a}{b} \right)^{n}$ y $c' = \left(\frac{a}{b} \right)^{n}$

Si $n$ es par, entonces $d' = c'$ y la proposición es verdadera.

Por tanto, se concluye que es falso que toda potencia que se obtiene de elevar a un mismo exponente un número racional y su opuesto es la misma.

3 0

3 years ago

What is the slope of the line that passes through the points (1, -6) and (-2, –8)?

Sloan [31]

Answer:

Where the line is going

Step-by-step explanation:

Put attention next time

Ps. Just check if its on x or on the y

7 0

3 years ago

This is a picture of a cube and the net for the cube. What is the surface area of the cube? 78in 169in 507in or 1,014in

Stolb23 [73]

Answer:

1014 cm^2.

Step-by-step explanation:

There are 6 square faces on the cube and each face has area 13^2 = 169 cm^2.

The total area is 169 * 6 = 1.014 cm^2.

5 0

3 years ago

Read 2 more answers

Amy purchased a house for $551,000 and obtained a mortgage for $519,000 she purchased 3 discount points and 2 origination points

Olegator [25]

Discount points are normally a type of prepaid interests that lowers the interest on subsequent payments for mortgage borrowers pay.

Each of the points is given by:

1 point = 1% of the mortgage value.

Therefore,
Cost of discount points = 0.01*519,000*3 = $15,570
Cost of origination points = 0.01*519,000*2 = $10,380

In this regard, option B. is the correct answer on the cost of discount and origination points respectively.

4 0

4 years ago