work out the shaded area

Answer:
Step-by-step explanation:
Shaded area:
Area of big rectangle - Area of small rectangle
[tex] = 10 \times 12 - (10 - 5) \times (12 - 2)[/tex]
Calculate the difference
[tex] = 10 \times 12 - 5 \times 10[/tex]
Calculate the product
[tex] = 120 - 50[/tex]
Calculate the difference
[tex] = 70 \: {cm}^{2} [/tex]
Hope this helps...
Best regards!!