Julian rides his bike uphill for 45 minutes, then turns around and rides back downhill. it takes him 15 minutes to get back to where he started. his uphill speed is 3 miles per hour slower than his downhill speed. find julian’s uphill and downhill speed.

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

What is the role of lenses in microscopy?

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas