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What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.