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navik [9.2K]
3 years ago
13

Is the difference between two rational numbers always rational number

Mathematics
2 answers:
vladimir1956 [14]3 years ago
7 0
Not always. It depends on the teacher and the school. Depends on the rules and how your being tought.
Alenkinab [10]3 years ago
6 0
Hello,

An integer is a rational number (ex 5=5/1=10/2...)
The sum of 2 rationals is a rational.
Substract a rational is adding its opposite.
The difference of 2 rationals is always a rational (substraction is a intern law)
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PLEASE HELP
gayaneshka [121]
Area would be 66

You would simply multiple the width be the height to get your area!
5 0
3 years ago
help an ogre out- A toy designer is creating a basketball plushy. The designer has fabric that measures 171.9 sq. in. What is th
trapecia [35]

Answer: 3.7 in.

Step-by-step explanation:

Given,   A toy designer is creating a basketball plushy. The designer has fabric that measures 171.9 sq. in.

To find: The maximum radius of the basketball that the designer can create.

For this, Surface area of basketball = area of fabric

Formula: Surface area of sphere = 4\pi r^2, where r is the radius.

Then, 4\pi r^2=171.9

r^2=\dfrac{171.9}{4\pi}=\dfrac{171.9}{4\times3.14}\\\\\Rightarrow\ r=13.6863057325\\\\\Rightarrow\ r=\sqrt{13.6863057325}=3.69950074098\approx3.7

Hence, the maximum radius of the basketball that the designer can create is 3.7 in.  

4 0
3 years ago
Read 2 more answers
Determine which of the indicated column vectors are eigenvectors of the given matrix
gladu [14]
]Eigenvectors are found by the equation (A-\lambda I) \vec{v} = 0$ implying that \det(A-\lambda I) = 0. We then can write:

A-\lambda I = \left [ \begin{array}{cc} 4-\lambda & 2 \\ 5 & 1-\lambda \end{array}\right ] 

And:

\det(A-\lambda I) = (4-\lambda)(1-\lambda) - 10 = 0 

Gives us the characteristic polynomial:

\lambda^2 - 5 \lambda -6 = 0 \implies \lambda_1 = -1, \lambda_2 = 6

So, solving for each eigenvector subspace:

\left [ \begin{array}{cc} 4 & 2 \\ 5 & 1 \end{array} \right ] \left [ \begin{array}{c} x \\ y \end{array} \right ] = \left [ \begin{array}{c} -x \\ -y \end{array} \right ]

Gives us the system of equations:

4x + 2y = -x \newline 5x + y = - y 

Producing the subspace along the line y = -\frac{5}{2} x

We can see then that 3 is the answer. 



7 0
3 years ago
What two simpler problem can you use to find 9×38?
elena55 [62]
Just a shot in the dark: 9*30 and 9*8?
8 0
3 years ago
There are 60 apples and then add 59 apples two times . How many apples and there altogether
STALIN [3.7K]

Answer:

Step-by-step explanation:

59 apples two times = 59 x 2 = 118 apples

Total apples = 118 + 60 = 178 apples

7 0
3 years ago
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