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3 years ago

What is the area of a circle with a diameter of 4

Mathematics

2 answers:

miss Akunina [59]3 years ago

6 0

Answer: Area= 12.57.

Step-by-step explanation:

The area of a circle is pi × radius^2.

the diameter /2 = radius.

4/2=2(2 is radius)

The radius should be 2. You put that into the area formula which is A=pi(2)^2.

The area should be 12.57 and that is the final answer.

Elina [12.6K]3 years ago

4 0

The area of a circle is pi × radius^2.

Diameter / 2 = radius.

4 / 2 = 2

The radius is 2. Plug this value into the area formula.

A = pi(2)^2

Area = 12.57

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Help with this question please help

levacccp [35]

Slope is 2
Y intercept is 4

8 0

3 years ago

What is the y-intercept of the line passing through the point 5, -6 with a slope of -1 over 7

morpeh [17]

Answer:

The y-intercept is (0, -37/7).

Explanation:

When you have one point and the slope of a line you can find its equation by using the point-slope form of the linear function:

m = slope
point = (a, b)
point-slope equation: (y - b) = m (x - a).

Now substitute m = -1/7 and (a,b) = (5, - 6)

y - (-6) = -1/7 (x - 5)

Solve for y:

y + 6 = - 1/7 ( x - 5)

7y + 7(6) = - (x - 5)

7y + 42 = - x + 5

7y = - x + 5 - 42

7y = - x - 37

y = -(1/7)x - 37/7 ← this is the slope-intercept form of the equation.

The y-intercept is the point when x = 0. So, the corresponding y-coordinate is the constant term in the last equation:

y = 0 - 37/7 = - 37/7

And the y-intercept is the point (0, -37/7).

5 0

3 years ago

F(x) = 1/x^2 and g(x) = 1/2x+4<br><br> f[g(x)] = 4x 2 _____

Korolek [52]

Answer:

f[g(x)] = 4x²+1/16

Step-by-step explanation:

We need to put g(x) into f(x).

f[g(x)] = 1/(1/2x+4)²

f[g(x)] = 1/(1/4x²+16) Solve the exponential.

f[g(x)] = 1/(1/4x²+16) Simply the fraction.

f[g(x)] = 4x²+1/16

5 0

3 years ago

The outlier, 78, is removed removed from the data set shown

Dvinal [7]

Minus the orignal range 55 from the new range 22

d. 55-22
=33

7 0

3 years ago

Read 2 more answers

The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 256.3 and a standard deviation of

AnnyKZ [126]

Answer:

a) In the interval ( 55,9 ; 456,7 ) we will find 99,7 % of all values

b) In the interval ( 122,7 ; 389,9 ) we find 95,4 % of all values

Step-by-step explanation:

For a Normal distribution N (μ ; σ ) the Empirical rule establishes that the intervals:

( μ ± σ ) contains 68,3 % of all values

( μ ± 2σ ) contains 95,4 % of all values

( μ ± 3σ ) contains 99,7 % of all values

If N ( 256,3 ; 66,8 )

σ = 66,8 ⇒ 3*σ = 3 * 66,8 = 200,4

Then: 256,3 - 200,4 = 55,9

And 256,3 + 200,4 = 456,7

a) In the interval ( 55,9 ; 456,7 ) we will find 99,7 % of all values

b) 2*σ = 2 * 66,8 = 133,6

Then 256,3 - 133,6 = 122,7

And 256,3 + 133,6 = 389,90

Then in the interval ( 122,7 ; 389,9 ) we find 95,4 % of all values

4 0

3 years ago