help me please need answer fast!!!

A = 31.875 in²
[tex]\hookrightarrow \ \sf 12\dfrac{3}{4} \ \ * \ \ 2\dfrac{1}{2}[/tex]
[tex]\hookrightarrow \ \sf \dfrac{51}{4} \ \ * \ \ \dfrac{5}{2}[/tex]
[tex]\hookrightarrow \ \sf \dfrac{51*5}{4*2}[/tex]
[tex]\hookrightarrow \ \sf \dfrac{255}{8}[/tex]
[tex]\hookrightarrow \ \sf 31\dfrac{7}{8} \ in^2[/tex]
[tex]\hookrightarrow \ \sf 31.875 \ in^2[/tex]