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Karo-lina-s [1.5K]

2 years ago

13

How to be good at maths if you cant keep up in class

2 answers:

Papessa [141]2 years ago

5 0

You should definitely talk to your teacher about it, as well as check out Khan Academy online for detailed explanations and videos of the subject you're working on.

Eva8 [605]2 years ago

4 0

Tough question to answer in just a few words. For starters:

1) Read assigned portions of your textbook several times; outline what you are reading

2) Make a list of questions about material you don't understand; get help (here or from your teacher) with that material.

3) Read your textbook or other learning material BEFORE you attend class so that you'll have some familiarity with the vocabulary and subject matter. Going to class without having prepared in this way almost guarantees that you won't understand very much.

Plenty more. If you want further dialogue, ask some questions and I'll try to respond with something helpful.

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malfutka [58]

Sent a picture of the solution to the problem (s).

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2 years ago

Simplify (6x2 - 3 + 5x3) - (4x3 - 2x2 - 16

Masteriza [31]

Answer:

x^3 +8x^2 +13

Step-by-step explanation:

(6x^2 - 3 + 5x^3) - (4x^3 - 2x^2 - 16)

Distribute the minus sign

6x^2 - 3 + 5x^3 -4x^3 + 2x^2 + 16

Combine like terms

x^3 +8x^2 +13

8 0

3 years ago

The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we want to be 95% confident th

Aleks04 [339]

Answer:

The minimum sample size that can be taken is of 14 dogs.

Step-by-step explanation:

The formula for calculating the minimum sample size to estimate a population mean is given by:

$n=\frac{z^{2}\sigma^{2}}{e^{2}}$

The <u>first step</u> is obtaining the values we're going to use to replace in the formula.

Since we want to be 95% confident, $1-\alpha=0.95 \Rightarrow \alpha=0.05$ .

Therefore we look for the critical value $z_{\alpha/2}=1.96$ .

Then we calculate the variance:

$\sigma = 3.7 \Rightarrow \sigma^{2}=13.69$

And we have that:

$e=2 \Rightarrow e^{2}=4$

<u>Now</u> we replace in the formula with the values we've just obtained:

$n=\frac{1.96^{2}*13.69}{4}=13.1479\approx 14$

Therefore the minimum sample size that can be taken to guarantee that the sample mean is within 2 inches of the population mean is of 14 dogs.

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Step-by-step explanation:

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Step-by-step explanation:

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