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Harlamova29_29 [7]
3 years ago
7

Can someone simplify

Mathematics
1 answer:
Rashid [163]3 years ago
7 0

Answer:

Option (2). 2\frac{1}{4}

Step-by-step explanation:

The given expression is [-5\frac{1}{4}-(-7\frac{1}{2})]

We can rewrite the fractions as,

-5\frac{1}{4} = -(5+\frac{1}{4})

-7\frac{1}{2}=-(7+\frac{1}{2})

Now we will substitute the fractions in the expression,

[-(5+\frac{1}{4})]-[-(7+\frac{1}{2})]

= -(5+\frac{1}{4})+(7+\frac{1}{2})

= (-5 + 7) + (-\frac{1}{4}+\frac{1}{2})

= 2 + \frac{2-1}{4}

= 2 + \frac{1}{4}

= 2\frac{1}{4}

Therefore, Option (2). will be the answer.

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Ed is on a road trip. He has already traveled 203 miles and is driving at a rate of 63 miles per hour. Which equation could be u
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Two cards are drawn without replacement from a standard deck of 52 cards. What is the probability that one of the cards is red a
alukav5142 [94]
Total cards = 52
Total red cards = 26
Total black cards = 26

P(one red and one black) = P(red and then black)+ P(black and then red)
P(one red and one black) =(26/52)(26/51) + (26/52)(26/51)
P(one red and one black) = 26/51 (Answer A) 

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Answer: 26/51 (Answer A) 
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5 0
3 years ago
Si elegimos un día de la semana al azar, ¿qué probabilidad hay de que sea fin de semana (ya sabemos que hay dos días…)?
irga5000 [103]

Answer:

La probabilidad que hay de que sea fin de semana es \frac{2}{7}

Step-by-step explanation:

La Probabilidad es la mayor o menor posibilidad de que ocurra un determinado suceso. En otras palabras, la probabilidad establece una relación entre el número de sucesos favorables y el número total de sucesos posibles. Entonces, la probabilidad de un suceso cualquiera A se define como el cociente entre el número de casos favorables (número de casos en los que puede ocurrir o no el suceso A) y el número total de casos posibles. Esta se denomina Ley de Laplace.

P(A)=\frac{numero de casos favorables}{numero de casos posibles}

En este caso:

  • número de casos favorables: 2 (cantidad de días del fin de semana)
  • número de casos posibles: 7 (cantidad de días totales en la semana)

Reemplazando:

P(A)= \frac{2}{7}

<u><em>La probabilidad que hay de que sea fin de semana es </em></u>\frac{2}{7}<u><em></em></u>

3 0
3 years ago
In your random sample of 25 Chips Ahoy bags, you find a mean of 985 chips per bag, with a standard deviation of 10 chips. Run a
stealth61 [152]

Answer:

The p -value is less than 0.001.

Step-by-step explanation:

Given information:

Sample size = 25 chips

Sample mean = 985

Sample standard deviation = 10

Let as assume that sample is distributed normally.

The formula for test statistic

t=\frac{\overline{x}-\mu}{\frac{s}{\sqrt{n}}}

where,

\overline{x} is sample mean

μ is population mean.

s is sample standard deviation.

n is sample size.

The value of test statistic is

t=\frac{985-1000}{\frac{10}{\sqrt{25}}}

t=\frac{985-1000}{\frac{10}{\sqrt{25}}}

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The p-value is

p=2\times p(t

Therefore the p -value is less than 0.001.

6 0
3 years ago
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