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juin [17]
3 years ago
9

The area of a circle is 615.44 in2. What is the diameter of the circle? Use 3.14 for π.

Mathematics
2 answers:
Shalnov [3]3 years ago
6 0
615.44 = (3.14)(radius)^2 

<span>radius = square-root of (615.44/3.14) </span>

<span>diameter = radius x 2 </span>

<span>diameter = 28 inches 

3.14

</span>
Ugo [173]3 years ago
6 0

Answer:

the answer is D

Step-by-step explanation:

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Given f(x) = 2* and g(x) = 2x + 1 evaluate (f?g)(o) and (g?f)(2).
vredina [299]
F(x)•g(x)=
2(2x+1)=
4x+2
4(0)+2= 2

f(x)•g(x)=
2(2x+1)=
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4(2)+2= 10
3 0
3 years ago
According to the American Lung Association, 7% of the population has lung disease. Of those having lung disease, 90% are smokers
postnew [5]

Answer:

Probability that a smoker has lung disease = 0.2132

Step-by-step explanation:

Let L = event that % of population having lung disease, P(L) = 0.07

So,% of population not having lung disease, P(L') = 1 - P(L) = 1 - 0.07 = 0.93

S = event that person is smoker

% of population that are smokers given they are having lung disease, P(S/L) = 0.90

% of population that are smokers given they are not having lung disease, P(S/L') = 0.25

We know that, conditional probability formula is given by;

                        P(S/L) = \frac{P(S\bigcap L)}{P(L)}  

                        P(S\bigcap L) = P(S/L) * P(L)

                                      = 0.90 * 0.07 = 0.063

So,  P(S\bigcap L) = 0.063 .

Now, probability that a smoker has lung disease is given by = P(L/S)

      P(L/S) = \frac{P(S\bigcap L)}{P(S)}

P(S) = P(S/L) * P(L) + P(S/L') * P(L')

       = 0.90 * 0.07 + 0.25 * 0.93 = 0.2955

Therefore, P(L/S) = \frac{0.063}{0.2955} = 0.2132

Hence, probability that a smoker has lung disease is 0.2132 .

7 0
4 years ago
3. The circumference of a circle is 607 cm. What is the diameter of the circle?
steposvetlana [31]

Answer:

the circumference is 30 cm,

Step-by-step explanation:

Hope it helps

8 0
2 years ago
How do you find the base area of a rectangular prism and a cylinder? Please help
Pani-rosa [81]

Answer:

See explanation.

Step-by-step explanation:

The 'base' of a rectangular prism refers to only one side of the rectangular prism, which is a rectangle.

The formula for the area of a rectangle is as follows:

A=lw

Where A = area, l = length, and w = width.

The 'base' of a cylinder refers to only one side of the cylinder, which is a circle.

The formula for the area of a circle is as follows:

A=\pi r^2

Where A = area and r = radius.

Just in case you typed your question incorrectly and were asking for surface area, here is the formula for surface area for both as well:

Rectangular prism: A=2(wl+hl+hw)\\

Cylinder: A=2\pi rh+2\pi r^{2}

3 0
4 years ago
Kail Ryans 10 laps around the track each day each lap around the track is 400 m meters how many times around the track will she
Semmy [17]
Hello

1 km = 1000 m

12 km = 12,000 m

Each day, she runs 10 * 400 m = 4000 m

12,000 m / 4000 m = 3

It will take 3 days.

Have a nice day
5 0
4 years ago
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