Is the following function linear or nonlinear?

In a young single person's monthly budget, $150 is spent on food, $175 is spent on housing, and $175 is spend on other items. suppose you drew a circle graph to represent this information, what percent of the graph represents housing?

Find the value of x to the nearest tenth.

Factor the gcf out of the polynomial 9x^6+6x^4+15x^3