15.4 = -2.1 + a
0.2
help pleasee

Answer:
a = 3.5
Step-by-step explanation:
[tex]15.4=-2.1+\frac{a}{0.2} \\\\\frac{a}{0.2} =15.4+2.1\\\\\frac{a}{0.2} =17.5\\\\a=3.5[/tex]