Alex draws the scale model shown as a plan for a large wall mosaic. 10 cm 12 cm

a. The wall is 10 m wide and 7 m high. What are the dimensions of the largest mosaic he can make on that wall? Explain.

b. He will use 2-cm square tiles to make his mosaic. How many tiles will he need? Explain how you found your answer.

Please help and answer. Thank you.