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3 years ago

Please help :) Please help :)

Mathematics

2 answers:

pishuonlain [190]3 years ago

4 0

Answer:

Step-by-step explanation:

igomit [66]3 years ago

4 0

Answer:

Step-by-step explanation:

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2z -3y + x +(-5y)-6z - 3x simplify exspression

Makovka662 [10]

Answer:

−2x−8y−4z

Hope this is what you wanted :)

8 0

3 years ago

Read 2 more answers

In a sample of 388 people in a certain, 22% had red hair. Find a 99% confidence interval for the proportion of people in the cou

Anit [1.1K]

Answer: (0.1658, 0.2742)

Step-by-step explanation:

Formula to find the confidence interval for population proportion is given by :-

$\hat{p}\pm z^*\sqrrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

, where n= sample size

z*= Critical value

$\hat{p}$ = sample proportion.

As per given , we have

Significance level : $\alpha=1-0.99=0.01$

According to z-table, Critical value for 99% confidence interval : z*=2.576

Let p be the proportion of people in the country that have red hair.

n= 388

$\hat{p}=0.22$

Now, required confidence interval for proportion of people in the country that have red hair will be :-

$0.22\pm (2.576)\sqrt{\dfrac{0.22(1-0.22)}{388}}$

$0.22\pm (2.576)\sqrt{0.000442268}$

$0.22\pm (2.576)(0.02103)$

$(0.22-0.05417328,\ 0.22+0.05417328 )=(0.16582672,\ 0.27417328)\\\\\approx(0.1658,\ 0.2742)$

The 99% confidence interval for the proportion of people in the country that have red hair= (0.1658, 0.2742)

8 0

3 years ago

A) Find the value of x.

Tcecarenko [31]

It is a pentagon. The sum of all angles of pentagon is 540°.

A) $(x+10)+(2x-10)+(x-25)+(x+20)+(x-13)=540$
$x=93$

B) x+20 = 93+20 = 113°. The adjacent exterior angle is 180 - 113 = 67°

5 0

3 years ago

Please check image !! WORTH 30 points !!!!!

hammer [34]

Answer:

1) x ≤ 30

2) 5x + 2x ≥ 14

3) x × y ≤ 4

4) y - 5 < 20

Step-by-step explanation:

At most means " no more than, " " less than or equal to, " or " not greater than"

The math symbol that you will use for at most is ≤

At least means " no less than " or " greater than or equal to "

The math symbol that you will use for at least is ≥

4 0

2 years ago

PLEASE HELP!!!!!

weeeeeb [17]

Answer: 9.1-10=0.2x

Step-by-step explanation:

9.1 = −0.2x + 10

−0.2x + 10 = 9.1

−0.2x + 10 − 10 = 9.1 −10

−0.2x = −0.9

−0.2x / −0.2 = −0.9 / −0.2

x=4.5

10 = 9.1 + 0.2x

10 = 0.2x + 9.1

0.2x + 9.1 = 10

0.2x + 9.1 − 9.1 = 10 − 9.1

0.2x = 0.9

0.2x / 0.2 = 0.9 / 0.2

x=4.5

10 − 0.2x = 9.1

10 + (−0.2x) = 9.1

−0.2x + 10 = 9.1

−0.2x + 10 − 10 = 9.1 − 10

−0.2x = −0.9

−0.2x / −0.2 = −0.9 / −0.2

x=4.5

9.1 - 10 = 0.2x

-0.9 = 0.2x

-0.9 / 0.2 = 0.2x / 0.2

x= -4.5

7 0

3 years ago

Please help :) Please help :)​

Please help :) Please help :)