22 pencils divided by three people evenly

HELP ME PLEASE LIKE PLEASE HELP

Sidana [21]

Answer:

go check my question you will love it

Step-by-step explanation:

7 0

3 years ago

(2+3i)+(-4+i) left-parenthesis 2 plus 3 i right-parenthesis plus left-parenthesis negative 4 plus i right-parenthesis

Triss [41]

Answer:

-2 + 4i

Step-by-step explanation:

1) remove unnecessary parentheses:

2 + 3i + (-4 + i)

2) calculate difference:

-4 + 2 = -2

-2 + 3i + i

3) collect like terms:

For our answer: -2 + 4i

There ya go, hope I helped good luck!

4 0

3 years ago

2m=-6n-5 literal equation

Bingel [31]

Answer:

read below

Step-by-step explanation:

Alright, archtan /

tan

−

1

(

x

)

is the inverse of tangent. Tan is

sin

cos

. Like the inverse of sin, the inverse of tan is also restricted to quadrants 1 and 4.

Knowing this we are solving for the inverse of tan -1. We are basically being asked the question what angle/radian does tan(-1) equal. Using the unit circle we can see that tan(1)= pi/4.

Since the "Odds and Evens Identity" states that tan(-x) = -tan(x). Tan(-1)= -pi/4.

Knowing that tan is negative in quadrants 2 and 4. the answer is in either of those two quadrants. BUT!!! since inverse of tan is restricted to quadrants 1 and 4 we are left with the only answer -pi/4.

the answer is m=-3n-5/2 or n=2m+5/6

8 0

3 years ago

In a survey, 498 out of 1,397 us adults said they drink at least 4 cups of coffee a day. find a point estimate (p) for the popul

valentinak56 [21]

Let X be the number of adults who drink at least 4 cups of coffee a day. Let n be the sample size and p be the proportion of adults who drink at least 4 cups of coffee a day.

Given : n=1397 and x =498

a. Point estimate p for the population proportion is sample proportion

p = x/n = 498/1397 = 0.3564

p= 0.3564

b .90% confidence interval for population proportion.

The distribution of sample proportion is normal with parameters

mean =p =0.3564

standard deviation = $\sqrt{\frac{p*(1-p)}{n}}$

= $\sqrt{\frac{0.3564*(1-0.3564)}{1397}}$

standard deviation = 0.0128

The 90% confidence interval for population proportion is

(p - Margin of error, p+ margin of error)

where Margin of error = $z _{\alpha/2}\sqrt{\frac{p*(1-p)}{n} }$

where $z_{\alpha/2}$ is critical z score value for 90% confidence interval

alpha = 1- c = 1 - 0.9 = 0.1

$z_{\alpha/2}$ = $z_{0.1/2}$ = z (0.05)

This is z score value for which probability below -z is 0.05 and probability above z is 0.05

Using excel function to find z score for probability 0.05

P(Z < z) = 0.05

z = NORM.S.INV(0.05) = -1.645

For calculating confidence interval we consider positive z score value

z = 1.645

Margin of error = $z _{\alpha/2}\sqrt{\frac{p*(1-p)}{n} }$

= $1.645\sqrt{\frac{0.3564*(1-0.3564)}{1397} }$

= 1.645 * 0.0128

Margin of error = 0.021

The 90% confidence interval for population proportion is

(p - Margin of error, p+ margin of error)

(0.3564 - 0.021, 0.3564 + 0.021)

(0.3354 , 0.3774)

a 90% confidence interval for the proportion of adults who drink at least 4 cups of coffee a day is (0.3354, 0.3774)

8 0

4 years ago

Please help me!!

Zepler [3.9K]

Answer:

The answer is C

Step-by-step explanation:

y = 4x + 12

y = 4(3) + 12

y = 12 + 12

y=24

y = 4x + 12

y = 4(5) + 12

y=20+12

y=32

y = 4x + 12

y = 4(8) + 12

y=32+12

y=44

6 0

3 years ago