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3 years ago

What is the area of a circle is the radius is 8

Mathematics

2 answers:

Shalnov [3]3 years ago

8 0

When the radius is 8, the area would be 201.06

Area of circle = pi x radius² (pi x 8²)

topjm [15]3 years ago

7 0

Step-by-step explanation: To find the area of the circle,

start with the formula for the area of a circle, which is $A = \pi r^{2}$ .

Notice that our circle has a radius of 8 units.

So plugging into the formula, we have (π)(8 units)².

Now, (8 units)² is equal to 8 units × 8 units or 64 units².

So we have 64π units² which is an exact answer.

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PLEASE HELP [Area & Circumference]

agasfer [191]

Answer:

circumference=diameter ×pi

=(29×2)× pi

=59×pi

area= pie × radius²

=pi×29²

=841pi

circumference =pi×16.5

area=pi×8.25²

153.94÷pi

radius=square root of 49.00062388

=7.000044563

times by 2

=14.00008913

28.27÷pi

8.998620482=diameter

divide by two to find radius

4.499310241

then square

20.24379265

then times that by pi

=63.59775026

4 0

3 years ago

18. A line has slope = -9 and goes through the point (-4,-2). What is the equation of this line in point-slope form? A. y + 2 =

Vitek1552 [10]

Given:

A line has a slope = -9

The line passing through the point (-4 , -2)

the general form of the equation of the line in point - slope form is :

$y-k=m\mathrm{}(x-h)$

Where: m is the slope, and ( h,k) is the point

So,

$\begin{gathered} m=-9 \\ h=-4 \\ k=-2 \end{gathered}$

So, the equation of the line will be:

$\begin{gathered} y-(-2)=-9\cdot(x-(-4)) \\ \\ y+2=-9(x+4) \end{gathered}$

The answer is option C. y + 2 = -9 ( x + 4 )

8 0

1 year ago

Two rays that intersect at their initial point.

dolphi86 [110]

That is called an angle.

4 0

4 years ago

Read 2 more answers

SAT practice: Find the solution (x,y) to the system of equations below, what is the value of x-y (show work)

Zanzabum

$7x + 3y = 8 \\ y = 2x - \frac{5}{3}$

Substitute the given value of x into the first equation

$7x + 3( 2x- \frac{5}{3} ) = 8$

To solve for x distribute 3 though the parentheses

$7x + 6x - 5 = 8$

Collect like terms

$13x - 5 = 8$

Move the constant to the right-hand side and change its sign

$13x = 8 + 5$

Add the numbers

$13x = 13$

Divide both sides of the equation by 13

$x = 1$

Now, Substitute the given value of x into the second equation

$y = 2x - \frac{5}{3}$

Plug in the value of x in the equation i.e. 1

$y = 2 \times 1 - \frac{5}{3}$

Any number multiplied by 1 results in number itself

$y = 2 - \frac{5}{3}$

Calculate the difference

$y = \frac{1}{3}$

The possible solution of the system is the ordered pair (x,y)

$(x,y)=(1, \frac{1}{3} )$

6 0

3 years ago

Assume that when adults with smart phones are randomly selected 46% use them in meetings or classes if 20 adult smartphone users

Hunter-Best [27]

Answer:

0.0818.

Step-by-step explanation:

This question can be solved using the binomial theorem because the probability of success is fixed.

Total adults = n = 20

Required attempts = r = 12

Probability of success = p = 3/4 = 0.46

Binomial Theorem formula:

P(X=r) = nCr * p^r * (1-p)^(n-r).

Substituting the values:

P(X=12) = 20C12 * 0.46^12 * (1-0.46)^8

P(X=12) = 125970 * 0.46^12 * (0.54)^8 = 0.0818 (to the nearest 3 significant figures).

So the probability that exactly 12 people use their smart phones in meetings or classes out of 20 is 0.0818!!!

8 0

4 years ago