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70 units²

Step-by-step explanation:

Area of the figure = area of rectangle + area of triangle

= L*W + ½*bh

L = 10

W = 5

b = 5

h = 18 - 10 = 8

Substitute:

Area of the figure = 10*5 + ½*5*8

= 50 + 20

= 70 units²

C, 40

Step-by-step explanation:

If there are 12 seats in each row, and 486 hamsters total, then we can safely assume one hamster takes up one seat.

To find out how many rows they can take, we need to divide the number of hamsters by the number of seats to get 486 / 12 approximately equals 40.