ANSWER:
Carla needs 1288 square inches of mirror
STEP-BY-STEP EXPLANATION:
We have that the surface area of a rectangular prism is calculated as follows:
[tex]\begin{gathered} A=2\cdot l\cdot w+2\cdot l\cdot h+2\cdot h\cdot w \\ l=14 \\ w=14 \\ h=16 \end{gathered}[/tex]replacing:
[tex]\begin{gathered} A=2\cdot14\cdot14+2\cdot14\cdot16+2\cdot14\cdot16 \\ A=2\cdot14\cdot14+4\cdot14\cdot16 \\ A=392+896 \\ A=1288 \end{gathered}[/tex]