Simplify the expression
-5+i/2i
show all work

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Find the quotient with the restriction.

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of