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When only separate discreet points are graphed it is called?

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74