What is the sum of the polynomials (8x2-9y2-4x)+(x2-3y2-7x).

Paint should be stored and mixed in an osha-approved room with all of the following, except: a) adequate ventilation b) ventilation hoods c) unshielded electrical devices d) fire extinguishers

By what percent will the product of two numbers change, if the first number increases by 70%, while the second number decreases by 40%.

Late at night some traffic signals change patterns and become ?