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3 years ago

Please help me s+5s=

Mathematics

2 answers:

AfilCa [17]3 years ago

4 0

Answer:

s+5s=6s

Step-by-step explanation:

not sure if im right but hope this helps

lawyer [7]3 years ago

3 0

Answer:

Step-by-step explanation:

s+5s = 1s + 5s = 6s

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An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an est

nirvana33 [79]

Answer:

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

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:

$\alpha = \frac{1-0.8}{2} = 0.1$

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 $1-0.1 = 0.99$ , so $z = 1.28$

Now, find 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.

$M = 1.28*\frac{4.1}{\sqrt{840}} = 0.2$

The lower end of the interval is the sample mean subtracted by M. So it is 40.6 - 0.2 = 40.4 words per minute.

The upper end of the interval is the sample mean added to M. So it is 40.6 + 0.2 = 40.8 words per minute.

The 80% confidence interval for the mean number of words a third grader can read per minute is between 40.4 wpm and 40.8 wpm.

3 0

4 years ago

if one tulip one daisy and two mums cost $4.20 and 2 daisies one tulip and one mum costs $3.80 and two tulips and two mums cost

Flura [38]

Answer:

$5.60

Step-by-step explanation:

7 0

3 years ago

Two triangles are shown. The first triangle has sides x, 6 cm, and 12 cm, and the second triangle has corresponding sides 20 cm,

swat32

Answer:

Given the two triangles are shown:

First triangle has sides x cm , 6 cm and 12 cm.

and

Second triangle has sides 20 cm , 8 cm and 16 cm.

Since, the given two triangles are Similar.

⇒there corresponding sides are in proportion.

i,e

$\frac{x}{20}=\frac{6}{8}=\frac{12}{16}$

(a)

$\frac{x}{20}=\frac{12}{16}$

Solve for x;

By cross multiply we have;

$16x = 240$

Divide both sides by 16 we get;

$x = 15$ cm

(b)

Find x using the ratio sides:

$\frac{6}{8} = \frac{x}{20}$

By cross multiply we have;

$120 = 8x$

Divide both sides by 8 we get;

$15 = x$

$x = 15$ cm

The value of x =15 cm in both a and b is same because the given two triangles are similar,

by definition of similarity, the given triangles have their corresponding sides are in proportion.

5 0

3 years ago

Hi, I'm actually a good student i do my own work but this stuff makes no sense to me, my teacher isn't the best so if you could

Grace [21]

1. an = 15 (1/3)^(n-1)
because it starts from 1,2,3,4........ for n.
2. a₁= 10(-8)^(1-1)=10
an= 10(-8)^(n-1)
3. an=2(1/3)^(n-1)
4. a₁= 1/2 (4/3)^0=1/2
an= 1/2 (4/3)^(n-1)
Hopes this loves.

3 0

3 years ago

Mr. Walker gave his class the function f(x) = (x + 3)(x + 5). Four students made a claim about the function. Each student’s clai

damaskus [11]

Answer: stephen was correct

Step-by-step explanation:

i just did it now

7 0

3 years ago