Answer: <em>уравнение имеет 2 решения:</em>
<em>               x₁ = - 4;    x₂ = - 2.</em>
Step-by-step explanation:
<em>Ix + 3I = 1</em>
<em>1) x + 3 = 1</em>
<em>   x + 3 - 3 = 1 - 3</em>
<em>   x = -2</em>
<em>2) - (x + 3) = 1</em>
<em>    x + 3 = - 1</em>
<em>    x + 3 - 3 = - 1 - 3</em>
<em>    x = - 4</em>
 
        
             
        
        
        
Answer:
(31zy)/(13xz)
Step-by-step explanation:
A reciprocal is a number that you can multiply the original number by and get a product of 1. To find the reciprocal of a fraction, flip it upside down, putting the numerator in the denominator, and the denominator in the numerator:

If we multiply this fraction by the other, we would end up simplifying it to 1 by cross multiplication.
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
We are given a triangle 
whose sides are 
a=12
b=8
c=13
Since, c is largest among them 
So, angle C must be largest angle
we can find angle C
we can use law of cosine formula 

now, we can plug values


now, we can find angle
we get 
