Which of the following best describes the equation below?
y=4x+9

a) both linear and nonlinear

b) nonlinear

c) linear

d) neither linear nor nonlinear

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

The standard distance between studs in a house is 1.5 feet. if you have a set of blueprints for a house that mark every 1.5 feet with 2 in., by how many inches will a 13-foot wall be represented?

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial