Answer:
10.6
Step-by-step explanation:
radius = 1.5 height = 1.5 so it's 10.6
There will be eight marbles on the 9th line
The two numbers are 48 and 18.
66 = l + s
l = 2 + 3s
66 = 2 + 3s + s
66 = 2 + 4s
66 - 2 = 64
64 = 4s
64 / 4 = 16
66 = l + 16
66 - 16 = 50
50 - 2 = 48
16 + 2 = 18
66 = 48 + 18