Answer:
80 in.²
Step-by-step explanation:
The total surface area of the pyramid is the sum of the area of the base and the areas of the 4 triangular sides.
Square: area = s²
Square: side = 4 in.
Triangular side: area = bh/2
Triangular side: base = 4 in.; height = 8 in.
Area of the base: s² = (4 in.)² = 16 in.²
Total area of the 4 triangular sides: 4 × bh/2 = 2bh = 2 × 4 in. × 8 in. = 64 in.²
Surface area = 16 in.² + 64 in.² = 80 in.²
Common denominators of 9 and 3 are 9. 27
Common denominators of 9 and 2 are 18 36
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-12c to the fourth power +18c to the third power! :)
The order of the 3 books does not matter so its the number of combinations of 3 from 45
b is the correct choice
