Which of the following is a health risk associated with ground-level ozone?
a cataracts
b. skin cancer
C. respiratory illness
d. all of the above

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)