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3 years ago

-27 Irrational or rational

Mathematics

2 answers:

shutvik [7]3 years ago

6 0

Answer:

rational

Step-by-step explanation:

irrational is something like pi or square root of 3, -27 is a simple number.

Dmitriy789 [7]3 years ago

4 0

Answer:

Yes, since it can be written as a fraction

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Divide r+5/r^2+5r-14 by r^2+4r-21/r-2

sergey [27]

r+5 r^2+4r-21
-------------- / --------------------
r^2+5r-14 r-2

 r+5 r-2
= -------------- x --------------------
r^2+5r-14 r^2+4r-21

 r+5 r-2
= -------------- x --------------------
 (r+7)(r-2) (r+7)(r-3)

 r+5
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 (r+7)^2 (r-3)

7 0

3 years ago

¿Cuál es la factorización en primos de 10? (el formato de la espuesta es 7x7)

mihalych1998 [28]

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4 0

3 years ago

An aeroplane at an altitude of 200m observes the angle of depression of opposite points on the two banks of a river to be 45 and

blagie [28]

Answer:

84.5 m

Step-by-step explanation:

It is often helpful to draw a diagram for word problems involving geometric relationships. One for this problem is shown below.

The mnemonic SOH CAH TOA reminds you of the relationship between sides of a right triangle:

Tan = Opposite/Adjacent

Here we're given angles of depression measured from the horizontal (as shown in the diagram), but it is more convenient to use angles measured from the vertical. In particular, ∠BAO is the complement of 60°, and its tangent is the ratio OB/OA:

tan(30°) = OB/OA

OB = (200 m)·tan(30°) ≈ 115.47 m . . . . . . multiply by OA, use OA=200 m

Likewise, we have ...

OC = (200 m)·tan(45°) = 200 m

Then the width of the river is the difference between these values:

BC = OC -OB = 200 m - 115.47 m = 84.53 m

4 0

4 years ago

Can you please help me?

zubka84 [21]

So the right answer is 9

Look at the attached picture

Hope it will help you...

Good luck on your assignment

3 0

3 years ago

If five numbers are selected at random from the set {1,2,3,...,20}, what is the probability that their minimum is larger than 5?

Zanzabum

Answer:

the probability that their minimum is larger than 5 is 0.2373

Step-by-step explanation:

For calculate the probability we need to make a división between the total ways to selected the 5 numbers and the ways to select the five numbers in which every number is larger than 5.

So the number of possibilities to select 5 numbers from 20 is:

20 * 20 * 20 * 20 * 20

First number 2nd number 3rd number 4th number 5th number

Taking into account that a number can be chosen more than once, and the order in which you select the numbers matters, for every position we have 20 options so, there are $20^{5}$ ways to select 5 numbers.

Then the number of possibilities in which their minimum number is larger than 5 is calculate as:

15 * 15 * 15 * 15 * 15

First number 2nd number 3rd number 4th number 5th number

This time for every option we can choose number from 6 to 20, so we have 15 numbers for every option and the total ways that satisfy the condition are $15^{5}$

So the probability P can be calculate as:

$P=\frac{15^{5} }{20^{5} } \\P=0.2373$

Then the probability that their minimum is larger than 5 is 0.2373

7 0

3 years ago