How do i solve and how do i know the propertys'

What are the domain and range of the function? f(x) = -4 (sqrt)x

Draw a tape diagram to represent each situation. for some of the situations, you need to decide what to represent with a variable andre bakes 9 pans of brownies. he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x