Ok last question lol

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

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

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