Anything helps this is the last one

What is the measure of the smallest angle in the diagram? 15 29 32 45

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

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