The range of x will be -5 to 9 so -5° < x < 9°.
What is a triangle?
The three-sided shape known as a triangle is sometimes used to allude to it. Every triangle has three sides and three angles, some of which might be the same.
The sum of all three angles inside a triangle will be 180° and the area of a triangle is given as (1/2) × base × height.
The minimum possible value of angle 3x + 15 is 0°
So,
3x + 15 = 0
x = -5
The maximum possible value of angle 3x + 15 is 42°
So,
3x + 15 = 42
x = 9
Hence the range of x will be -5° < x < 9°.
For more about triangles,
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