To factor 9x^2-16 you can first rewrite the expression as:
a. ()^2
b. (3x-4)^2
c. (3x)^2-(4)
d. none of the above
answer is a. (3x)^2-(4)^2

7x+8y=-18, 4x-9y=-3 solve the system of equations

Which equation represents a line that passes through the point (9, -4) and has a slope of 3/5?

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.