Math help??????????????

Can someone help me with the first 3 as it is my first time doing it ? I need help

Fed [463]

You problem is you don't have any problem. You have a bunch of formulas for the perimeter and area of some shapes.

As for using the formulas, usually you're given all but one of the variables and you can solve for the remaining one.

Notice how the triangle result doesn't have area as a function of a, b and c. That's called Heron's formula and is usually not taught to secondary school students. I don't like to teach it either because Archimedes' Theorem is so much better:

The sides a,b,c and area S of a triangle satisfy

$16S^2 = (a+b+c)(-a+b+c)(a-b+c)(a+b-c) = 4a^2b^2-(c^2-a^2-b^2)^2 = (a^2+b^2+c^2)^2 - 2(a^4+b^4+c^4)$

7 0

3 years ago

Nonsense will be reported!!

Contact [7]

Answer:

See below

Step-by-step explanation:

d = 78° (Vertical angles)

h = 70° (Vertical angles)

Measure of angles d and h are are not equal. therefore they are not congruent.

7 0

3 years ago

A sample of size 100 is selected from a population with p = .40.

zhuklara [117]

Answer:

(a) 0.40

(b) 0.049

(c) $\bar p\sim N(0.40,0.049^{2})$

(d) Explained below

Step-by-step explanation:

According to the Central limit theorem, if from an unknown population large samples of sizes n > 30, are selected and the sample proportion for each sample is computed then the sampling distribution of sample proportion follows a Normal distribution.

The mean of this sampling distribution of sample proportion is:

$E(\bar p)=p$

The standard deviation of this sampling distribution of sample proportion is:

$SE(\bar p)=\sqrt{\frac{p(1-p)}{n}}$

Given:

n = 100

p = 0.40

As n = 100 > 30 the Central limit theorem is applicable.

(a)

Compute the expected value of $\bar p$ as follows:

$E(\bar p)=p=0.40$

The expected value of $\bar p$ is 0.40.

(b)

Compute the standard error of $\bar p$ as follows:

$SE(\bar p)=\sqrt{\frac{p(1-p)}{n}}=\sqrt{\frac{0.40(1-0.40)}{100}}=0.049$

The standard error of $\bar p$ is 0.049.

(c)

The sampling distribution of $\bar p$ is:

$\bar p\sim N(0.40,0.049^{2})$

(d)

The sampling distribution of p show that as the sample size is increasing the distribution is approximated by the normal distribution.

3 0

4 years ago

A faucet leaks 75 milliliter a minute how long in 220 minutes

nordsb [41]

Answer:

16500

Step-by-step explanation:

If it leaks 75 mL a minute you multiply that by the 220. Then you get 16,500

8 0

4 years ago

Read 2 more answers

Which is true of a geometric plane? A) one-dimensional B) two-dimensional C) three-dimensional D) no dimensions, only position

Sedbober [7]

Answer:

The correct option is B.

Step-by-step explanation:

A plane extends infinitely in two dimensions. It has no thickness.The plane has two dimensions: length and width. But since the plane extends infinitely,the length and width cannot be measured.

Lets take an example of a flat sheet of metal. Imagine a flat sheet of metal. Now make it infinitely large in both directions. This means that no matter how far you go, you never reach its edges. Now imagine that it is so thin that it actually has no thickness at all. In spite of this, it remains completely rigid and flat. This is the 'plane' in geometry.

6 0

3 years ago