How many square feet of material is needed to cover all outer sections of the resulting figure?
O 1,152 ft2
O 1,552 ft2
O 1,560 ft?
O 1,680 ft?

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)