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snow_lady [41]
3 years ago
14

-5x -10 >30 help Hehehehehe.

Mathematics
1 answer:
Mnenie [13.5K]3 years ago
4 0

Answer:

x<-8

Step-by-step explanation:

-5x-10>30

(add 10 to both sides)

-5x-10+10>30+10

-5x>40

\frac{-5x}{-1}<\frac{40}{-1}

(dividing through by -1 changes the sign of the inequality from "<" to ">")

5x<-40

(dividing through by 5)

\frac{5x}{5}<\frac{-40}{5\\}

x<-8

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Zielflug [23.3K]

Answer:

1. Let the number is x

a) 8 more than 4 times a number is 28

<u>Required equation:</u>

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b) <u>Example would be:</u>

Four teams of same number of members joined together and the team of eight joined them adding up to 28 people.

3.

  • Height - h, length - l
  • h = 1/3l
  • h = 5 feet, l = ?

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  • l = 3h
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8.

<u>Equation:</u>

  • 6a - 16 = b

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6 packs of each containing a number of items. It was reduced by 16 (sold) and b number of items left in the stock.

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2 years ago
250% of 9.4 mi is what distance
slava [35]

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Step-by-step explanation:

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What is happening to the pieces (units) when the numerator and denominator are getting larger?
ohaa [14]

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Step-by-step explanation:

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2 years ago
The formula for perimeter of a rectangle is P=2L+2W where L is the length and w is the width. A rectangle has a perimeter of 24
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8 0
2 years ago
If t follows a t7 distribution, find t0 such that (a) p(|t | &lt; t0) = .9 and (b) p(t &gt; t0) = .05.
Thepotemich [5.8K]

Answer:

a) P(-t_o < t_7

Using the symmetrical property we can write this like this:

1-2P(t_7

We can solve for the probability like this:

2P(t_7

P(t_7

And we can find the value using the following excel code: "=T.INV(0.05,7)"

So on this case the answer would be t_o =\pm 1.895

b) For this case we can use the complement rule and we got:

1-P(t_7

We can solve for the probability and we got:

P(t_7

And we can use the following excel code to find the value"=T.INV(0.95;7)"

And the answer would be t_o = 1.895

Step-by-step explanation:

Previous concepts

The t distribution (Student’s t-distribution) is a "probability distribution that is used to estimate population parameters when the sample size is small (n<30) or when the population variance is unknown".

The shape of the t distribution is determined by its degrees of freedom and when the degrees of freedom increase the t distirbution becomes a normal distribution approximately.  

The degrees of freedom represent "the number of independent observations in a set of data. For example if we estimate a mean score from a single sample, the number of independent observations would be equal to the sample size minus one."

Solution to the problem

For this case we know that t \sim t(df=7)

And we want to find:

Part a

P(|t|

We can rewrite the expression using properties for the absolute value like this:

P(-t_o < t_7

Using the symmetrical property we can write this like this:

1-2P(t_7

We can solve for the probability like this:

2P(t_7

P(t_7

And we can find the value using the following excel code: "=T.INV(0.05,7)"

So on this case the answer would be t_o =\pm 1.895

Part b

P(t>t_o) =0.05

For this case we can use the complement rule and we got:

1-P(t_7

We can solve for the probability and we got:

P(t_7

And we can use the following excel code to find the value"=T.INV(0.95;7)"

And the answer would be t_o = 1.895

5 0
3 years ago
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