Find the slope of the line that passes through 9,7 and 6,15

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g