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horsena [70]
3 years ago
5

Find the circumference of the circle if the diameter is 27m. Use 3.14 for Pi.

Mathematics
1 answer:
MissTica3 years ago
8 0

Answer:

Circumference= 84.78 or if needed simplified 85

Step-by-step explanation:

c=2×3.14×r

in this case to get the radius divide the diameter by 2 which would equal 13.5 so the formula would be

2×3.14×13.5=84.78

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Suppose a deck of cards contains 13 cards:
ira [324]

Answer:

P(G_1) = \frac{5}{13}

P(G_2) = \frac{1}{3}

P(X \ge 1) = \frac{25}{39}

Step-by-step explanation:

Given

G = 5

R = 4

B = 4

n = 13

Solving (a): P(G_1)

This is calculated as:

P(G_1) = \frac{G}{n}

P(G_1) = \frac{5}{13}

Solving (b): P(G_2)

This is calculated as:

P(G_2) = \frac{G - 1}{n - 1} -- this is so because the selection is without replacement

P(G_2) = \frac{5 - 1}{13 - 1}

P(G_2) = \frac{4}{12}

P(G_2) = \frac{1}{3}

Solving (c): P(X \ge 1)

Using the complement rule, we have:

P(X \ge 1) = 1 - P(X = 0)

To calculate P(X = 0), we have:

G = 5 --- Green

G' = 8 ---- Not green

The probability that both selections are not green is:

P(X = 0) = P(G'_1) * P(G'_2)

So, we have:

P(X = 0) = \frac{G'}{n} * \frac{G'-1}{n-1}

P(X = 0) = \frac{8}{13} * \frac{8-1}{13-1}

P(X = 0) = \frac{8}{13} * \frac{7}{12}

Simplify

P(X = 0) = \frac{2}{13} * \frac{7}{3}

P(X = 0) = \frac{14}{39}

Recall that:

P(X \ge 1) = 1 - P(X = 0)

P(X \ge 1) = 1 - \frac{14}{39}

Take LCM

P(X \ge 1) = \frac{39 -14}{39}

P(X \ge 1) = \frac{25}{39}

7 0
3 years ago
Max observes the zoo and the library from a helicopter flying at a height of 200 times square root of 3 feet above the ground, a
juin [17]

Answer:

The distance between the zoo and the library is 400ft

Step-by-step explanation:

Let x be the distance between point G and the zoo

Let y be the distance between the zoo and the library

To solve this problem quickly, we use trigonometric relations

tan(angle) = opposite cathetus / adjacent cathetus

In this case

tan(30) = (200√3) / (x+y)

(x+y) =  (200√3)/ tan(30)

(x+y) = 600 ft

For the other angle

tan(60) = (200√3) / (x)

(x) =  (200√3)/ tan(60)

x = 200 ft

y = 600 ft - 200 ft = 400 ft

The distance between the zoo and the library is 400ft

7 0
3 years ago
Read 2 more answers
What is the diameter of the smallest circle that would enclose 2,000 pennies?
vladimir1956 [14]

Answer:

Almost about 4500 mm

Step-by-step explanation:

Measure the pennies width and estimate. Multilpy by 2000 and there you go!

4 0
3 years ago
What is the percentage change ? 54 decreased to 32?
Dimas [21]

Answer:

21

Step-by-step explanation:

4 0
2 years ago
What is the value of the expression x + (–y) when x = –2.3 and y = –5.9? A. –8.2 B. –3.6 C. 3.6 D. 8.2
11Alexandr11 [23.1K]
Now it would be
-2.3+(-5.9)

now just add those two together
and u get -8.2
So the answer is A
7 0
3 years ago
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