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3 years ago

12

Please I need help is the answer is C

1 answer:

NemiM [27]3 years ago

8 0

It’s d because 2x4x8 = 64

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B. 40 is 160% of what number?

Anton [14]

Answer:

25

Step-by-step explanation:

the question basically translates to

160% x n =40

a little trick with percents I use is that the word "of" always means multiplication.

n=40/160%=25

6 0

2 years ago

Recent census data indicated that 14.2% of adults between the ages of 25 and 34 live with their parents. A random sample of 125

kicyunya [14]

Answer:

The probability is $P(14 < X < 20 ) = 0.5354$

Step-by-step explanation:

From the question we are told that

The proportion that live with their parents is $\r p = 0.142$

The sample size is n = 125

Given that there are two possible outcomes and that this outcomes are independent of each other then we can say the Recent census data follows a Binomial distribution

i.e

$X \ \~ \ B( \mu , \sigma )$

Now the mean is evaluated as

$\mu = n * \r p$

$\mu = 125 * 0.142$

$\mu = 17.75$

Generally the proportion that are not staying with parents is

$\r q = 1 - \r p$

= > $\r q = 0.858$

The standard deviation is mathematically evaluated as

$\sigma = \sqrt{n * \r p * \r q }$

$\sigma = \sqrt{ 125 * 0.142 * 0.858 }$

$\sigma = 3.90$

Given the n is large then we can use normal approximation to evaluate the probability as follows

$P(14 < X < 20 ) = P( \frac{ 14 - 17.75}{3.90}$

Now applying continuity correction

$P(14 < X < 20 ) = P( \frac{ 13.5 - 17.75}{3.90} < \frac{ X - \mu }{\sigma } < \frac{ 19.5 - 17.75}{3.90} )$

Generally

$\frac{ X - \mu }{\sigma } = Z ( The \ standardized \ value \ of X )$

$P(14 < X < 20 ) = P( \frac{ 13.5 - 17.75}{3.90} < Z< \frac{ 19.5 - 17.75}{3.90} )$

$P(14 < X < 20 ) = P( -1.0897 < Z< 0.449 } )$

$P(14 < X < 20 ) = P( Z< 0.449 ) - P(Z < -1.0897)$

So for the z - table

$P( Z< 0.449 ) = 0.67328$

$P(Z < -1.0897) = 0.13792$

$P(14 < X < 20 ) = 0.67328 - 0.13792$

$P(14 < X < 20 ) = 0.5354$

6 0

3 years ago

How to sketch the solutions to each. systems of inequalities

zloy xaker [14]

It depends what inequality you have

4 0

2 years ago

The length of a rectangle is 5cm greater than its width. The perimeter is 58. What are the dimensions of the rectangle

Doss [256]

Perimeter= 2w+2l
l=w+5

Substitute for l
p= 2w+2(w+5)
p= 2w+2w+10
p= 4w+10
58=4w+10
48=4w
12= w

Plug in the width to find length.
l= 12+5
l=17

Final answer: Length-17 cm, Width-12 cm

7 0

3 years ago

Read 2 more answers

Which of the following are equations for the line shown below? Check all that

Monica [59]

Answer: A, B, C

Step-by-step explanation:

$m=\frac{-5-3}{4-(-4)}=-1$

Substituting into point-slope form, we get $y-3=-(x+4)$ and $y+5=-(x-4)$ . Rearranging this into slope-intercept form,

$y-3=-(x+4)\\\\y-3=-x-4\\\\y=-x+1$

6 0

1 year ago