56cm
Perimeter: 30cm
Width: 7cm
7+7+?+?
30-14=16
?=8
Area= 56cm
Answer:
72
Step-by-step explanation:
1 large cube is 2 x 3 cubes equals 6
length is 3 x 4 x 2 = 24
24 x 3 = 72 for each layer
72 x 2 = 144 smaller cubea
Answer:
36
Step-by-step explanation:
We can use combinations
9 choose 2 =
9!/(7!*2!) = (9*8)/2 = 36
so, start floor = x
x + 7 - 9 - 4 + 8 - 2 = 14
x = 14
the elevator started on the 14th floor.
to verify: 14 + 7 = 21 - 9 = 12 - 4 = 8 + 8 = 16 - 2 = 14