Find the following images in width and circumference

What’s the domain of this function? fastttt

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

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