What is the value of 8 of a in the equation 5a-10b=45, when b=3

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis. how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

Which of the following expressions is equal to 2x^2+8

Me asap! what is the slope of this line? enter your answer in the box.