13. in the triangle below, the sides have length x + 3, 3x - 1. and 4x. determine the range of possible
values of x.

Hence as long as x > 2/3, we can form a triangle from the three given sides.

Step-by-step explanation:

Given:

Length of 3 sides of triangle are

Solution:

From the length of the 2nd side 4x, we know that x > 0

Let this be 1 st statement.

Now from the triangle inequality we can say that;

No new information from this because of the 1st statement above.

Also,  

Lastly,

and again no new information is obtained from this inequality.

Hence as long as x > 2/3, we can form a triangle from the three given sides.

d. all of the above

step-by-step explanation: