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AVprozaik [17]
3 years ago
11

Is the number rational or irrational?

Mathematics
1 answer:
Maru [420]3 years ago
5 0
Well an <span>an </span>irrational number<span> is a real </span>number that cannot be expressed as a ratio of integers, i.e. as a fraction. A rational number<span> is a </span>number<span> that can be written as a ratio. So 3/7 is a rational number, 0.38(with a line saying its continuous over .38) is rational, Square of 7/9 is irrational number, and 5 pi is an irrational number.</span>
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When Sharon begin shopping this morning, she have $40. she purchased 5 paperback books and had lunch. The books were all the sam
sertanlavr [38]
Call the price of a book 'b'. We know that lunch cost $3.25 so let's say L=3.25 we also know the total is $40. So we can write: 
T=L+5b+7
or
40=3.25+5b+7 
and then solve for 'b':
29.75=5b
b=\frac{29.75}{5} = 5.95

A book cost $5.95
8 0
3 years ago
What is the factored form of 4x^2+23x-72
ohaa [14]
4x^2+23x-72=

4x(x+8)-9(x+8)=

i got dis 4 yo answer and it is (x+8)(4x-9)

hope dis helped
4 0
3 years ago
Janice thinks that 20 hundredths is equivalent to 2 thousandths because 20 hundreds is equal to 2 thousands. Use words and a pla
expeople1 [14]

<em><u>Explanation</u></em>:

On the left hand side of the place value chart, 20 hundreds is equal to 2 thousands because thousands is larger than hundreds. 2 thousands is 2(1000)=2000. 20 hundreds is 20(100)=2000. They are the same number.

However, on the right hand side of the place value chart, hundredths is larger than thousandths. To say that 20 hundredths is the same as 2 thousandths is incorrect, because you're saying more of a larger quantity is the same as less of a smaller quantity.

Hundredths are two places after the decimal, and have a value of 0.01. 20 hundredths is 20(0.01) = 0.2.

Thousandths are three places after the decimal and have a value of 0.001. 2 thousandths is 2(0.001) = 0.002.

We can write 0.2 as 0.200; this way we can see that 0.200 is larger than 0.002. They are not equal.

3 0
3 years ago
Read 2 more answers
What is the equation, in point-slope form, of the line that is perpendicular to the given line and passes through the point (−4,
Stells [14]
Writing it in perpendicular form is easy as 1, 2, 3.

First you should put it in y = mx + b Form (Slope intercept)

#1: y = x + 7

Simply flip the reciprocals  

#2: y = -x + 7
7 0
3 years ago
The angle of depression from the top of a building to a point
AleksandrR [38]

The distance between point on the ground from the top of the building is 396 meter, if the building is 280 m high and The angle of depression from the top of a building to a point  on the ground is 45 degrees.

Step-by-step explanation:

The given is,

                 The angle of depression from the top of a building to a point  on the ground is 45 degrees.

                 Height of the building is 280 meter.

Step: 1

                 Given diagram is a right angled diagram,

                 For right angle triangle,

                              90° = 45° + 45°    

                                     = 90°  

                 Trignometric ratio,

                            sin ∅ = \frac{Opp}{Hyp}....................(1)

                For the above ratio take the bottom angle, that is angle of depression from the top of a building to a point  on the ground is 45 degrees.

                 Where, Opp side = 280 meters

                               Hyp side = x

                                           ∅ = 45°

                 Equation (1) becomes,

                                  sin 45° = \frac{280}{x}

                          0.70710678 =  \frac{280}{x}

                                            x =  \frac{280}{0.70710678}

                                            x = 395.979

               Distance between point on the ground from the top of the building,  x ≅ 396 meter                                                

                Trignometric ratio,

                                     cos ∅ = \frac{Adj}{Hyp}

                                   Cos 45 = \frac{Adj}{396}

                                         Adj = (0.70710678)(396)

              Bottom length, Adj = 280 meter

Result:

           The distance between point on the ground from the top of the building is 396 meter.

8 0
3 years ago
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