Answer:
Option A) The sum of x and y is a rational number
Step-by-step explanation:
we know that
A <u>rational number</u> is a number that can be written as a ratio or quotient of two integers
so
In this problem we have
![x=-5, y=-4](https://tex.z-dn.net/?f=x%3D-5%2C%20y%3D-4)
![x+y=-5-4=-9](https://tex.z-dn.net/?f=x%2By%3D-5-4%3D-9)
Is a rational number, because the number
can be written as a ratio or quotient of two integers
Example
![-\frac{27}{3}=-9](https://tex.z-dn.net/?f=-%5Cfrac%7B27%7D%7B3%7D%3D-9)
![-\frac{9}{1}=-9](https://tex.z-dn.net/?f=-%5Cfrac%7B9%7D%7B1%7D%3D-9)
3.2355
Fist we line up all the numbers, we forget about the decimal for a moment and we will come back to it in the end.
7.19
x0.45
----------
28760
We put 0 first because we are working on the ten place, and we do a normal multiplication problem: 4*9= 36 (bring the 3 over). 4*1= 4+3 = 7. 4*7= 28 Then we work on the second part.
7.19
x0.45
----------
<span> 28760
</span> <span>3555
</span>
As same as the first step, it is normal multiplication...
7.19
x0.45
----------
28760
<span>3555
</span>-----------
32315
We all both numbers together... For the final answer, we count the decimal place of the numbers given in the problem, 7.19 and 0.45. They both have 2 decimal places, so 2+2=4. So 4 decimal places. We give the final answer 4 decimal places.
3.2315
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You cant say anything about an, if bn>an>0 then we could deduce that an converges.
Answer:
Infinitely many solutions
Step-by-step explanation:
2y=14-2x
y=-x+7
------------
2(-x+7)=14-2x
-2x+14=14-2x
-2x-(-2x)=14-14
-2x+2x=0
0=0
infinitely many solutions
It’s 7.0x10^9 in scientific notation