Identify the angles of elevation and angles of depression

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Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)