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4 years ago

What's the formula to this ?!

Mathematics

1 answer:

nordsb [41]4 years ago

6 0

A = π r2

If r is the radius dividing both sides by pie3.14 gives you

A/π = r2

Then divide a by pie and then take the square root out to find r

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492032 word form and expanded form

amm1812

400,000+90,000+2,000+0+30+02=492,032 is the answer put that and you will get a good grade :)

7 0

3 years ago

Read 2 more answers

What is the sum of the first 37 terms of the arithmetic sequence?

lidiya [134]

Answer:

The sum of the first 37 terms of the arithmetic sequence is 2997.

Step-by-step explanation:

Arithmetic sequence concepts:

The general rule of an arithmetic sequence is the following:

$a_{n+1} = a_{n} + d$

In which d is the common diference between each term.

We can expand the general equation to find the nth term from the first, by the following equation:

$a_{n} = a_{1} + (n-1)*d$

The sum of the first n terms of an arithmetic sequence is given by:

$S_{n} = \frac{n(a_{1} + a_{n})}{2}$

In this question:

$a_{1} = -27, d = -21 - (-27) = -15 - (-21) = ... = 6$

We want the sum of the first 37 terms, so we have to find $a_{37}$

$a_{n} = a_{1} + (n-1)*d$

$a_{37} = a_{1} + (36)*d$

$a_{37} = -27 + 36*6$

$a_{37} = 189$

Then

$S_{37} = \frac{37(-27 + 189)}{2} = 2997$

The sum of the first 37 terms of the arithmetic sequence is 2997.

6 0

3 years ago

Which expression is equivalent to -3.5(4x – 3)?

Masja [62]

First, you need to solve the equation.

-3.5 * 4x = -14x
-3.5 * -3 = 10.5

C) -14x + 10.5

Hope this helps!

3 0

3 years ago

A cell phone company charges a $10 flat fee plus $0.05 per minute for minutes up to 600. For minutes over 600, the company

mash [69]

Answer:

In both the cases, the given total amount is given as:

T = 10 + 0.05 m (when minutes talked m < 600)

T = 40 + 0.15 k (when minutes talked k > 600)

Step-by-step explanation:

Here, the flat fee by the phone company = $10

The charge for each minute for first 600 minutes = $0.05

The per minute cost after 600 minutes = $0.15

Let us assume the number of minutes talked = m

Case 1: when the minutes talked is less than 600 minutes.

Total Charges = Flat Fee + 0.05 x ( the minutes talked)

or, T = $10 + m ($0.05)

or T = 10 + 0.05 m (when m < 600)

Case 2: when the minutes talked is more than 600 minutes.

Let us assume the minutes talked over 600 = k minutes

Total Charges = Flat Fee + Charges for 600 minutes + 0.15 x ( the minutes talked over 600)

or, T = $10 + 600 ($0.05) + k($0.15)

or T = 10 + $30 + 0.15 k (when k > 600)

⇒ T = 40 + 0.15 k (when k > 600)

Hence, in both the cases, the given total amount is given as:

T = 10 + 0.05 m (when m < 600)

T = T = 40 + 0.15 k (when k > 600)

7 0

3 years ago

Let x be a discrete random variable that possesses a binomial distribution with n=5 and p=0.87. What are the mean and standard d

Nookie1986 [14]

Answer:

$Mean = 4.35$

$SD = 0.5655$

Step-by-step explanation:

Given

$n = 5$

$p = 0.87$

Solving (a): Mean

$Mean = np$

$Mean = 5 * 0.87$

$Mean = 4.35$

Solving (b): Standard Deviation (SD)

$SD = np(1 - p)$

$SD = 5 * 0.87(1 - 0.87)$

$SD = 5 * 0.87 * 0.13$

$SD = 0.5655$

4 0

4 years ago