Give the domain and range.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.

Which best describes the function on the graph? direct variation; k = −2 direct variation; k = -1/2 inverse variation; k = −2 inverse variation; k = -1/2