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Answer:
d 60
Step-by-step explanation:
Rose's patio originally had 5 x 8 = 40 tiles (drawn in blue)
since she wants to put more tiles and form a 10 x 10 square, she will need to add: (10 x 10) - 40 = 100 - 40 = 60 tiles (white tiles)
Area= L*W (we are changing the area)
5*8=40 (the area of the old)
10*10= 100 (area of new)
100-40 = 60 (number of tiles to get to new from old)
Hope this helps