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3 years ago

What is the area of a triangle with a base of 6m and a height of 7m

Mathematics

1 answer:

Veronika [31]3 years ago

5 0

Answer:

It is 21

Step-by-step explanation:

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I need some help on this

asambeis [7]

It’s B.29 I hope this helps and you have a great day:)

6 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

4 years ago

Read 2 more answers

When josh planted his bean plant, it stood only 2 inches tall. Since then it has grown 3.25 inches every two weeks. Write the eq

inessss [21]

Answer:

y=3.25x+2

Step-by-step explanation:

Y is the total height after x weeks and since it has grown 3.25 inches per 2 weeks it would be 3.25x and add 2 because the initial height is 2 inches

6 0

3 years ago

What is the 20th term of the sequence that begins -3, 6, -12, 24...

Ksenya-84 [330]

This is a geometric sequence with first term -3 and common ratio -2, or $a_n=-3(-2)^{n-1}.$ Thus, $a_{20}=-3(-2)^{19}=\boxed{1572864}.$

6 0

3 years ago

What is the area of a 4 cm tall triangle

butalik [34]

Answer:

the base is 2 and the height is 4 or swapped

Step-by-step explanation:

8 0

4 years ago