Which of these is an acceptable less hazardous method of cleaning than solvents?

Late at night some traffic signals change patterns and become ?

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?

A(t)=(t−k)(t−3)(t−6)(t+3) is a polynomial function of tt, where kk is a constant. given that a(2)=0a(2)=0, what is the absolute value of the product of the zeros of aa?