Answer:
b = 2A/h
b = 6 inches
Step-by-step explanation:
[tex]A = \frac{1}{2} bh \\ \\ 2A =bh \\ \\ \purple{b = \frac{2A}{h}} \\ \\ plug \: A = 12 \: and \: h = 4 \\ \\ b = \frac{2 \times \cancel{12}}{ \cancel4} \\ \\ b = 2 \times 3 \\ \\ b \: = 6 \: in[/tex]
