someone help me please

Answer:
2.5 or 5/2
Step-by-step explanation:
The formula for the area of a triangle is \dfrac{bh}{2}, where b represents the length of the base and h represents the length of the height. With this in mind, you can set up the following equation:
[tex]\dfrac{15}{8}=\dfrac{1.5b}{2}[/tex]
[tex]\dfrac{15}{4}=1.5b[/tex]
b=2.5 or [tex]\frac{5}{2}[/tex]
Hope this helps!