How do you multiple 1 1/3 × 5/6

How do you find principle and simple interest

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

Find the midpoint m of z1=(8+5i) and z2=(12+3i)