Please answer as soon as possible. Appreciate answers. ​

Answer:

The answer for -7x + 8 - 4x - 9 is 1. -11x-1

Answer:

12

Step-by-step explanation:

2(5+1) =

2(6) =

12

Answer:

3/7

Step-by-step explanation:

You want to seperate the numbers from the variable.

Answer:

380

Step-by-step explanation:

multiply  20 x 19

Answer

B. 6 feet by 5 feet by 4 feet

C. 7 feet by 6 feet by 4 feet

D.  8 feet by 3 feet by 7 feet

Answer:b c d

Step-by-step explanation:

conformidad

Answer:

The 95% confidence interval for the difference between the proportion of all U.S. teens and adults who use social networking sites is (0.223, 0.297). This means that we are 95% sure that the true difference of the proportion is in this interval, between 0.223 and 0.297.

Step-by-step explanation:

Before building the confidence interval we need to understand the central limit theorem and the subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean [tex]\mu = p[/tex] and standard deviation [tex]s = \sqrt{\frac{p(1-p)}{n}}[/tex]

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Sample of 800 teens. 73% said that they use social networking sites.

This means that:

[tex]p_T = 0.73, s_T = \sqrt{\frac{0.73*0.27}{800}} = 0.0157[/tex]

Sample of 2253 adults. 47% said that they use social networking sites.

This means that:

[tex]p_A = 0.47,s_A = \sqrt{\frac{0.47*0.53}{2253}} = 0.0105[/tex]

Distribution of the difference:

[tex]p = p_T - p_A = 0.73 - 0.47 = 0.26[/tex]

[tex]s = \sqrt{s_T^2+s_A^2} = \sqrt{0.0157^2+0.0105^2} = 0.019[/tex]

Confidence interval:

Is given by:

[tex]p \pm zs[/tex]

In which

z is the zscore that has a pvalue of [tex]1 - \frac{\alpha}{2}[/tex].

95% confidence level

So [tex]\alpha = 0.05[/tex], z is the value of Z that has a pvalue of [tex]1 - \frac{0.05}{2} = 0.975[/tex], so [tex]Z = 1.96[/tex].

Lower bound:

[tex]p - 1.96s = 0.26 - 1.96*0.019 = 0.223[/tex]

Upper bound:

[tex]p + 1.96s = 0.26 + 1.96*0.019 = 0.297[/tex]

The 95% confidence interval for the difference between the proportion of all U.S. teens and adults who use social networking sites is (0.223, 0.297). This means that we are 95% sure that the true difference of the proportion is in this interval, between 0.223 and 0.297.

Answer:

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of [tex]\pi[/tex], and a confidence level of [tex]1-\alpha[/tex], we have the following confidence interval of proportions.

[tex]\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]

In which

z is the z-score that has a p-value of [tex]1 - \frac{\alpha}{2}[/tex].

Of the 533 randomly selected Americans surveyed, 351 were in favor of the initiative.

This means that [tex]n = 533, \pi = \frac{351}{533} = 0.6585[/tex]

90% confidence level

So [tex]\alpha = 0.1[/tex], z is the value of Z that has a p-value of [tex]1 - \frac{0.1}{2} = 0.95[/tex], so [tex]Z = 1.645[/tex].

The lower limit of this interval is:

[tex]\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 - 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6247[/tex]

The upper limit of this interval is:

[tex]\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 + 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6923[/tex]

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

Answer: 5

Step-by-step explanation:

Answer: B) dot plot with 2 dots over 75, 7 dots over 76, 3 dots over 77, 3 dots over 78, 1 dot over 79

Step-by-step explanation: took the test, hope this helps c:

Answer:

10.4 meters

Step-by-step explanation:

3² + 10² = c²

9 + 100 = c²

c² = 109

c = √109 ≈ 10.4

Answer:

-15625000x^24

Step-by-step explanation:

Answer:

10.44

Step-by-step explanation:

Answer:

B

Step-by-step explanation:

J = distributive

G = commutative

Answer: 77 days

Step-by-step explanation:

Answer:

x = 148

Step-by-step explanation:

vertical angles are congruent

the angle with a measure of 148° and the angle labeled "x" are vertical angles.

Hence, x = 148

Answer:

x=148 because the opposite angles are equal

also, the rest of the smaller angles are both 32 degrees if you need them

you can check because 148+148+32+32=360

hope it helps:)

Answer:

4' - 9.64

Step-by-step explanation:

Total rise = 2' - 7"

Total run = 3' - 9"

Converting to inches :

1' = 12" ; 1 feet = 12 inches

2' = 2 * 12 = 24"

3' = 3 * 12 = 36"

Total rise = 24" + 7" = 31"

Total run = 36" + 9" = 45"

Length of stringer = hypotenus

Hypotenus = √(total rise² + total run²)

Hypotenus = √(31² + 45²)

Hypotenus = 54.644304"

= 4' - 9.64"

Answer:

i got g

Step-by-step explanation:

Answer:

Step-by-step explanation:

G and h

Answer:

X = 13 ; Y = 16

Median Y > Median X

Battery Y lasts longer and hence better than Battery X.

Step-by-step explanation:

From the box plot, median value is the point marked by the vertical line in between the box located between the whiskers.

Median :

Brand X = 13

Brand Y = 16

This median value depicts that, average battery life of brand X batteries is 13 hours while that of brand Y batteries is 16 hours ; Median value of Y is greater Than median value of X ;

This means Brand Y batteries lasts longer on average than Brand X batteries.

Answer:

32 minutes or .5333 of an hour

Step-by-step explanation:

Answer:

I am not sure, but I think you would check for the side with the longest length(hypothenuse) and check if the formula of a^2+b^2=c^2(side with the longest length) satisfies it.

Answer:

Domain of the function 'f' → [tex](-\infty,\infty)[/tex]

Range of the function 'f' → [tex][0,\infty)[/tex]

Step-by-step explanation:

Parent function of an absolute function is,

g(x) = |x|

Domain of the parent function → [tex](-\infty,\infty)[/tex]

Range of the parent function → [tex][0,\infty)[/tex]

If the function 'g' is vertically stretched by a factor of 2, the new function will be,

h(x) = |2x|

Function 'g' is translated by 9 units to the left, then the new function will be,

f(x) = |2x + 9|

By shifting the parent function on x-axis domain of the function will remain same as of the parent function.

Domain of the function 'f' → [tex](-\infty,\infty)[/tex]

Since, there is no shifting along the y-axis therefore, Range of the function will remain the same as the parent.

Range of the function 'f' → [tex][0,\infty)[/tex]

Answer:

Step-by-step explanation:

a)   -1, 1, 5

b)   -3

c)   -1 to 6

d)    -3  to 2

e)  for a value, we need an input between or equal to -1 to 6,  what ever that x value is,  find it on the graph, then see what the y value is at that point.  That's your value of f    

Answer:

It's 160

I think you have a typo in d. If you do, the answer is d) V=(4 x 4) x 10

meaning a x 10 versus a + 10 as typed.

Step-by-step explanation:

.1m=10cm

volume = 4 x 4 x 10 = 160

Answer: B. 10

-5C3 or 5 choose 3 refers to how many combinations are possible from 5 items, taken 3 at a time. To calculate combinations, we will use the formula nCr = n! / r! ... * (n - r)!, where n represents the total number of items, and r represents the number of items being chosen at a time.

-10 is the total number of all possible combinations for choosing 3 elements at a time from 5 distinct elements without considering the order of elements in statistics & probability surveys or experiments. The number of combinations for sample space 5 CHOOSE 3 can also be written as 5C3 in the format of nCr or nCk.

Step-by-step explanation: Hope this help :D

Step-by-step explanation:

5×9×12=540

6×9×12÷2=324

324+540=864

Answer:

C. 1188 cubic meters

Step-by-step explanation:

"To find the volume, we must multiply the length x width x height"

The shape is too big so we must break it into another shape

Let's solve the bottom shape that looks like a rectangle!

Length: 12 m

Width: 9 m

Height: 5 m

Volume = 540 m

Now the top shape!

Length: 12 m

Width: 9 m

Height: 6 m

Volume = 648 m

Now we need to add both of the volume shapes!

648 + 540 = 1188 cubic meters

Answer:

4 ssquare units

Step-by-step explanation: