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2 years ago

Rational Numbers lbrainlyst if I get a B or more in 20 mins!!

Mathematics

2 answers:

Angelina_Jolie [31]2 years ago

7 0

Answer:

1 d) -5.1 2)5.111... 3) C 4) All of the points on the graph could represent rational numbers 5) Divide 2 by 6.) -20.75

Step-by-step explanation:

Hi There!

1) Converting this Mixed Fraction -5 1/9 into an Improper One:

$-5\frac{1}{9}=\frac{-46}{9}$

Keep the Denominator to the Improper Fraction

Multiply 9 by 5 then add the numerator 1, place the sign in the end

9*5+1=46

46/9 *(-1)

-46/9 =-5.111...

Dividing the numerator -46 by 9 =-5.11111....

2) Making it an Improper one makes it easier to understand and operate it.

$-5\frac{1}{9}=\frac{-46}{9}$

$\frac{46}{9}=5.111...$

That would be enough already. But the question has another goal.

And the goal of this question is to harmonize with what's been asked.

Regarding the second part, we want to get a denominator of 100 and then write the numerator as hundredths using a decimal point.

$\frac{-46}{9}*\frac{3}{20} =\frac{-138}{180}=0.766$

3) C

In the Real line the Opposite numbers are those multiplied by (-1), hence the opposite of -3.3 certainly is 3.3

4) All of the points on the graph could represent rational numbers.

Since Rational numbers are those that can be written as a quotient like a form $\frac{a}{b}$

Even Zero can be taken as a Rational once you can write it as $\frac{0}{b}$

5) Divide 2 by 6.

Just like any fraction, to convert it to its decimal form all you have to do is dividing the numerator by the denominator. In this case, Shalina will find 0.3333..

6)-20.75

Another conversion from Mixed Fraction to an Improper one

$-20\frac{3}{4}=\frac{20*4+3}{4}=\frac{83}{4}*(-1)=\frac{-83}{4} =-20.75$

Or if you already know that $\frac{3}{4}=0.75$ All that's left is to sum with the integer 20=20+0.75=20.75

Gnoma [55]2 years ago

6 0

Answer:

1.) -5.1

2.) personally I would not convert the way the would. There is a quicker way of converting that to decimal so idk exactly what they are doing unfortunately I can't help with you at the moment. I would need more time.

3.) Point C is the the opposite of -3.3

4.) D. 5.3333333 is a rational number

5.) All the points on the graph could represent rational numbers

6.) Simply Divide 2 by 6 to get repeating decimal

7.) -20.75 should be correct

Step-by-step explanation:

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Can someone please help me

lisov135 [29]

Answer:

5.83 or E

Step-by-step explanation:

Use Pythagorean theorem. 5^2+3^2=c^2 because the diameter is perpendicular it cuts the chord in half.

25+9=c^2

34=c^2

5.83

8 0

3 years ago

Read 2 more answers

Suppose that W1, W2, and W3 are independent uniform random variables with the following distributions: Wi ~ Uni(0,10*i). What is

nadya68 [22]

I'll leave the computation via R to you. The $W_i$ are distributed uniformly on the intervals $[0,10i]$ , so that

$f_{W_i}(w)=\begin{cases}\dfrac1{10i}&\text{for }0\le w\le10i\\\\0&\text{otherwise}\end{cases}$

each with mean/expectation

$E[W_i]=\displaystyle\int_{-\infty}^\infty wf_{W_i}(w)\,\mathrm dw=\int_0^{10i}\frac w{10i}\,\mathrm dw=5i$

and variance

$\mathrm{Var}[W_i]=E[(W_i-E[W_i])^2]=E[{W_i}^2]-E[W_i]^2$

We have

$E[{W_i}^2]=\displaystyle\int_{-\infty}^\infty w^2f_{W_i}(w)\,\mathrm dw=\int_0^{10i}\frac{w^2}{10i}\,\mathrm dw=\frac{100i^2}3$

so that

$\mathrm{Var}[W_i]=\dfrac{25i^2}3$

Now,

$E[W_1+W_2+W_3]=E[W_1]+E[W_2]+E[W_3]=5+10+15=30$

and

$\mathrm{Var}[W_1+W_2+W_3]=E\left[\big((W_1+W_2+W_3)-E[W_1+W_2+W_3]\big)^2\right]$

$\mathrm{Var}[W_1+W_2+W_3]=E[(W_1+W_2+W_3)^2]-E[W_1+W_2+W_3]^2$

We have

$(W_1+W_2+W_3)^2={W_1}^2+{W_2}^2+{W_3}^2+2(W_1W_2+W_1W_3+W_2W_3)$

$E[(W_1+W_2+W_3)^2]$

$=E[{W_1}^2]+E[{W_2}^2]+E[{W_3}^2]+2(E[W_1]E[W_2]+E[W_1]E[W_3]+E[W_2]E[W_3])$

because $W_i$ and $W_j$ are independent when $i\neq j$ , and so

$E[(W_1+W_2+W_3)^2]=\dfrac{100}3+\dfrac{400}3+300+2(50+75+150)=\dfrac{3050}3$

giving a variance of

$\mathrm{Var}[W_1+W_2+W_3]=\dfrac{3050}3-30^2=\dfrac{350}3$

and so the standard deviation is $\sqrt{\dfrac{350}3}\approx\boxed{116.67}$

# # #

A faster way, assuming you know the variance of a linear combination of independent random variables, is to compute

$\mathrm{Var}[W_1+W_2+W_3]$

$=\mathrm{Var}[W_1]+\mathrm{Var}[W_2]+\mathrm{Var}[W_3]+2(\mathrm{Cov}[W_1,W_2]+\mathrm{Cov}[W_1,W_3]+\mathrm{Cov}[W_2,W_3])$

and since the $W_i$ are independent, each covariance is 0. Then

$\mathrm{Var}[W_1+W_2+W_3]=\mathrm{Var}[W_1]+\mathrm{Var}[W_2]+\mathrm{Var}[W_3]$

$\mathrm{Var}[W_1+W_2+W_3]=\dfrac{25}3+\dfrac{100}3+75=\dfrac{350}3$

and take the square root to get the standard deviation.

8 0

3 years ago

Clare is paid $90 for 5 hours of work. At thos rate how many seconds does i take for her to earn 25 cents?

natka813 [3]

We are given

Clare is paid $90 for 5 hours of work

Total money paid =$90

total hours of work =5 hours

so, firstly we will find rate of work

rate of work = ( total money paid)/( total hours of work)

now, we can plug values

and we get

The rate of work is

$=\frac{90}{5}$

$=18$ $/ hour

now, we have to find time for amount paid is 25 cents

so, amount paid =25 cents

100 cents =1$

so, amount paid =$ 0.25

Since, the rate is constant

so, we can take same rate here

now, we can use formula

rate of work = ( total money paid)/( total hours of work)

now, we can plug values

$18=\frac{0.25}{T}$

now, we can solve for T

$T=\frac{0.25}{18}$ hour

since, T is in hours

so, we can change into seconds

1 hour =3600seconds

so, we can plug

$T=\frac{0.25}{18}\times 3600$ seconds

$T=50$ seconds......................Answer

6 0

3 years ago

When the weght of apples is increased by 4 what is the total cost increase

inn [45]

The answer will be is 1

3 0

3 years ago

Simplify this expression 1/2(362 -4)

Arisa [49]

The answer is 179!!!!!!!!!!!!!!!!!!!!

5 0

3 years ago