Answer:
19 ) B (<2 and <5)
20) A(20)
21 and 22 Don't know sorry
Answer:
2/3
Step-by -step explanation:
For this case we have the following system of equations:

We multiply the first equation by -4:

We have the following equivalent system of equations:

We add the equations:

We find the value of the variable "x":

Thus, the solution of the system is:

See the graphic in the attached image
ANswer:

See the graphic in the attached image
Answer:
The solution for the other side length is the interval
(2.5,6.5)
Step-by-step explanation:
I will assume that is a triangle
we know that
The <u><em>Triangle Inequality Theorem</em></u> states that the sum of any 2 sides of a triangle must be greater than the measure of the third side
Let
x ---> the measure of the third side
Applying the Triangle Inequality Theorem
1) 

Rewrite

2) 

therefore
The solution for the other side length is the interval
(2.5,6.5)
Answer:
7
Step-by-step explanation:
Let n represent the number. The problem statement tells you ...
... 2n - 17 = -3
... 2n = 14 . . . . . add 17
... n = 7 . . . . . . . divide by 2
The number is 7.