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What 8/12+8/11 in another way than and improper fraction

Einstein office equipment has a rental plan for office machines. a fax machine that lists for $722.98 can be rented for 22% of the price annually. the state imposes a usage charge of 3.2%. if stephen hawking travel decides to rent the fax machine, what will its total monthly rental charge be?

Which graph or graphs appear to show a sinusoid? < me asap !