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Irina-Kira [14]
3 years ago
10

Which expression is equivalent to (7x−5)−(3x−2)?

Mathematics
1 answer:
Alchen [17]3 years ago
4 0

Answer:

D. 4x-3

Step-by-step explanation:

First you subtract the 7x and 3x to get 4x.

Then you subtract the -5 and the -2 to get -3

Therfore, your answer is D

You might be interested in
Which ordered pairs are soultions to the inequality y-2x<-3
Anna35 [415]

Answer:

<em>(-3, 3/2)</em>

Step-by-step explanation:

Given the inequality function y-2x<-3, to get the solution, we will need to find the x and y-intercept of the inequality function

y-intercept occurs at x = 0

Substitute x = 0  into the expression

y - 2(0) < -3

y < -3

Find the x-intercept by substituting y = 0 into the expression

0 - 2x < -3

-2x < -3

x > 3/2

<em>Hence the ordered pair is (x, y) = (-3, 3/2)</em>

4 0
3 years ago
10)<br> A) x + 2 y = 1<br> C) x - 2y = 10<br> B) x-1= 2<br> D) x – 2y=
sertanlavr [38]

Answer:

B)

Step-by-step explanation:

y-intercept = -2

slope = 1

in slope-intercept form the line would be:  y = x - 2

if we subtract 'x' from each side we get:

-x + y = -2

we don't want to leave 'x' as negative so we can multiply each term by -1 to get:

x - y = 2

4 0
3 years ago
7. Se llevó a cabo una encuesta de mercado para calcular la proporción de amas de casa que reconocerían el nombre de la marca de
Norma-Jean [14]

Answer:

a) El valor de la proporción de la población = 0.3

b) El intervalo de confianza de 99% de la proporción poblacional = [0.2685, 0.3315]

c) Interprete sus conclusiones.

De los cálculos anteriores, podemos concluir que tenemos un 99% de confianza en que el parámetro de población se encuentra entre 0.2685 y 0.3315 ".

Step-by-step explanation:

a) Halla el valor de la proporción de la población.

El valor de la proporción se calcula mediante la fórmula

p = x / n

donde x = 420

n = número de muestras = 1400

Proporción (p) = 420/1400

= 60/200 = 30/100 = 3/10

= 0.3

b) Construya el intervalo de confianza del 99% para la proporción de población.

La fórmula para el intervalo de confianza para la proporción de población =

p ± z × √p (1 - p) / n

p = 0.3

z = puntuación z para un intervalo de confianza del 99% = 2.576

n = 1400

Por lo tanto:

Intervalo de confianza del 99% = 0.3 ± 2.576 × √0.3(1 - 0.3) / 1400

= 0.3 ± 2.576 × √0.3× 0.7 / 1400

= 0.3 ± 2.576 × 0.0122474487

= 0.3 ± 0.0315494279

Intervalo de confianza del 99% =

0.3 - 0.0315494279

= 0.2684505721

Aproximadamente ≈ 0.2685

0.3 + 0.0315494279

= 0.3315494279

Aproximadamente ≈ 0.3315

Por lo tanto, el intervalo de confianza del 99% = [0.2685, 0.3315]

c) Interprete sus conclusiones.

De los cálculos anteriores, podemos concluir que tenemos un 99% de confianza en que el parámetro de población se encuentra entre 0.2685 y 0.3315 ".

6 0
3 years ago
Simplify and select the answer with the appropriate restrictions for the variables. 4x^2 + 8x/x^2 - x - 6
DaniilM [7]
\frac{4x^2+8x}{x^2-x-6}\\\\Domain:x^2-x-6\neq0\\\\x^2-3x+2x-3\cdot2=x(x-3)+2(x-3)=(x-3)(x+2)\\\\x^2-x-6\neq0\iff(x-3)(x+2)\neq0\iff x-3\neq0\ or\ x+2\neq0\\\\therefore\ x\neq3\ and\ x\neq-2\\------------------\\the\ nominator:\ 4x^2+8x=4x\cdot x+4x\cdot2=4x(x+2)\\the\ denominator:x^2-x-6=(x-3)(x+2)

therefore\ simplify\ form:\\\\\frac{4x^2+8x}{x^2-x-6}=\frac{4x(x+2)}{(x-3)(x+2)}=\boxed{\frac{4x}{x-3}}
6 0
3 years ago
Find the area of the parallelogram.
ArbitrLikvidat [17]

Answer:

160 {ft}^{2}

Step-by-step explanation:

Area of parallelogram =base x height

Area=20 x 8=160

Units=

ft {}^{2}

6 0
3 years ago
Read 2 more answers
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