I have no idea how to do this

What is the range of this function? all real numbers such that y ≤ 40 all real numbers such that y ≥ 0 all real numbers such that 0 ≤ y ≤ 40 all real numbers such that 37.75 ≤ y ≤ 40

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?