| Official SAT study guide's answer explanations?
can someone explain me these questions =
1. Tim wrote a seven digit phone number on a piece of paper. he later tore the paper accidentally and the last two digits were lost. what is the maximum number of arrangements of two digits, using the digits 0 through 9, that he could use in attempting to reconstruct the correct phone number?
the answer is 100, my answer is 90 hahaha
2. page 369 number 8
sorry i can't write the question down coz there's a graph
thx! | 
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