The surface area of a sphere is 19what is the sphere radius

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Line l passes through points (0,4) and (3,6) what is the slope of a line that is parallel to line l -2/3 -3/2 2/3 3/2

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.