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elena-14-01-66 [18.8K]
3 years ago
14

Pork chops cost $1.39 per pound.

Mathematics
2 answers:
matrenka [14]3 years ago
5 0

Answer: a) $4.17

b) $6.95

Step-by-step explanation:

3 * 1.39 = 4.17

5 * 1.39 = 6.95

ladessa [460]3 years ago
3 0

Answer:

3 pounds of pork chops cost 4.17 and 5 pounds cost 6.95

Step-by-step explanation:

you multiply 1.39 times 3 to find how many pounds the pork chops are for 3 pounds and 1.39 times 5 to find the cost.

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"D" size batteries produced by MNM Corporation have had a life expectancy of 87 hours. Because of an improved production process
9966 [12]

Answer:

As p-value = 0.0.68 > 0.05   the null hypothesis could not be rejected

Step-by-step explanation:

The computation of the p-value is shown below:

Given that

Average life = \bar x = 88.5

Standard deviation = \sigma = 9

Sample = n = 80

Based on the above information

Null and alternative hypothesis is

H_o : u = 87\\\\H_a : u > 87

Now for the level of significance \alpha = 0.05 and the critical value for a right talied test is z_c = 1.64

Now the test statistic is

z = \frac{\bar x  - u_o}{\sigma/\sqrt{n} }\\\\= \frac{88.5-87}{9/\sqrt{80} }

= 1.491

Now it is observed that

Z = 1.49≤z_ c = 1.64

So by this the null hypothesis could not be rejected

So,

P -value = 1 - P(z<1.491)

P-value = 0.068

As p-value = 0.0.68 > 0.05   the null hypothesis could not be rejected

3 0
3 years ago
Un par de zapatos más dos pantalones valen $ 70.000 en una tienda. Se ofrece una oferta, al comprar dos o más pares de zapatos d
Sauron [17]

Answer:

49.5 $

Step-by-step explanation:

Comencemos por lo siguiente:

Si llamamos  x al precio del  par de zapatos  y  "y"  al precio de cada pantalón, entonces la tienda ofrece:

un par de zapatos   x    más dos pantalones   2*y  en  70.000 $  (deben ser 70 $ pero esa cifra no importa a los fines de resolver el problema, habrá solo que hacer el ajuste correspondiente, en lo que aqui respecta hablaremos de 70 $)

Entonces  de acuerdo a lo expuesto

x  +  2y  =  70         or    y  =  ( 70 - x) /2      (1)

Esa es la condición inicial.

Ahora bién  Juan paga por tres pantalones  38.25 $

Eso quiere decir ( como los pantalones son iguales) que pago 38.25/3 por cada pantalón

38.25/3  =  12.75 $

Ahora bién ese precio tubo una rebaja del precio original del 15 % ( quiere decir que el precio original de cada pantalón es de

12.75/0.85  =  15 $            x =  15 $

Entonces si nos vamos a la ecuación (1) (alli los precios son originales) tenemos que

y  =  ( 70  - x ) / 2       y  =  ( 70 - 15 ) / 2    y  = 55/2     y  =  27.5 $

Ahora Juan paga por dos pares de zapatos donde según las ofertas de la tienda el debera tener un descuento del 10 % en cada par

Por lo que si  un par cuesta  27.5 $  le darán un descuento del 10% es decir pagará  27.5 *0.9 =   24.75  por cada par, como son dos pares

pagará 2 * 24.75  =   49.5 $

8 0
3 years ago
Year 11 math methods, help pls
Ludmilka [50]

Answer:

\frac{1}{180} (x - 90) {}^{2}  + 30 = y

Step-by-step explanation:

Please see the attachment:

4 0
3 years ago
The variable Z is directly proportional to X. When X is 3, Z has the value 57. What is the value of Z when X = 8
Olin [163]
When x = 3 z = 57 57/3 = 19
19*8 = 152
So when X is equal to 8, Z is equal to 152.
5 0
3 years ago
The scatter plot and regression line below show the relationship between how early students turned in an exam (measured by minut
likoan [24]

Step-by-step explanation:

Based off of the fitted line, we obtain expected values, given an input. If the input is 0 minutes remaining (meaning a student turns in a test with no time remaining), the expected value of their exam score is 87.

4 0
3 years ago
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