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3 years ago

Help plz so close to being done

Mathematics

2 answers:

Natasha2012 [34]3 years ago

8 0

Answer:

20 is the answer I got

algol [13]3 years ago

4 0

The answer for the area is 20

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What is 3a ^2 + a ^2 added to a +6 ?

KonstantinChe [14]

Answer:

it is a polynomial

3a^2+a^2= 4a^2

4a^2+6

Step-by-step explanation:

3a^2 +a^2 = 4a^2+6

=4a^2+6

7 0

3 years ago

You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you beli

zhuklara [117]

Answer:

We need to sample at least 1069 parents.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How many parents do you have to sample?

We need to sample at least n parents.

n is found when $M = 4, \sigma = 79.5$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$4 = 1.645*\frac{79.5}{\sqrt{n}}$

$4\sqrt{n} = 1.645*79.5$

$\sqrt{n} = \frac{1.645*79.5}{4}$

$(\sqrt{n})^{2} = (\frac{1.645*79.5}{4})^{2}$

$n = 1068.92$

Rounding up

We need to sample at least 1069 parents.

6 0

3 years ago

Read 2 more answers

FIRST RIGHT GET BRAAINLYEST·⇔∀⊅⇆∠⊥∫ФФ

Fed [463]

Answer: Check attached picture

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Please can I have some help thank you :)

Evgen [1.6K]

9514 1404 393

Answer:

£592 for 16 boxes

Step-by-step explanation:

The classroom floor area is ...

A = LW = (8.8 m)(2.2 m) = 19.36 m²

The cupboard floor area is ...

A = (2.3 m)(2.1 m) = 4.83 m²

Then the total area to be covered is ...

19.36 m² +4.83 m² = 24.19 m²

At 1.6 m² per box, the number of boxes required is ...

(24.19 m²)/(1.6 m²/box) = 15.12 boxes

If we assume we can only purchase whole boxes, we need to purchase 16 boxes to cover the floor. The cost will be ...

(16 boxes)(£37/box) = £592 . . . . cost of laminate to replace the floor

8 0

3 years ago

Question (in need of help)

mr Goodwill [35]

<h3>Required Answer:-</h3>

This is an right angle ∆ and the side lengths containing a right angle are 9 and 11.

By Pythagoras theoram,

${p}^{2} + {b}^{2} = {h}^{2}$

where p is the perpendicular, b is the base and h is the hypotenuse.

Plugging the values,

${9}^{2} + {11}^{2} = {h}^{2}$

Then,

$h = \sqrt{ {9}^{2} + {11}^{2} }$

$h = 14.12(approx.)$

<h3>Hence:-</h3>

The x of the right angled ∆ = 14.12

6 0

3 years ago

Read 2 more answers