Using the formula for velocity shown below, what is the average velocity of a bicyclist who biked 20 miles north of where he began for a duration of 4 hours?

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3

Give one example of a pure (exact) number and of an estimated (measured) number.