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Factor Tree of 20: ........20 ......../ \ .......4 5 ....../ \ .....2 2
Let the height of the tree be x: x/10 = 5/4 x = 50/4 The tree is 12.5 feet
Assuming you can use the values listed, and the phone number is 7 digits (e.g. XXX-XXXX), then you can select 3 numbers for the first digit (0 is exempt) then 4 selections for the rest of the digits. So, 3*4*4*4*4*4*4 = 12288 phone numbers.
You cannot. The tree diagram for tossing 4 coins has 16 branches. So if that is done 96 times, you will have a tree with 1696 branches which is approx 4 trillion googol branches.