Based on the information given, the value of h is 9.
Firstly, it should be noted that the sum of the angles that are on a straight line is 180°.
In this case, we'll have to equate both values that are given and this will be:
3h + 18° + 15h = 180°
Collect like terms
3h + 15h = 180° - 18°
18h = 162°
Divide both sides by 18
18h/18 = 162°/18
h = 9
Therefore, the value of h will be 9
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