Atruncated cone has horizontal bases with radii 18 and 2. a sphere is tangent to the top, bottom, and lateral surface of the truncated cone. what is the radius of the sphere?

Which seasons are the northern and southern hemispheres experiencing in the image? it is summer in both the northern and southern hemispheres. it is summer in the northern hemisphere and winter in the southern hemisphere. it is winter in both the northern and southern hemispheres. it is winter in the northern hemisphere and summer in the southern hemisphere.

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve