If a bicyclist travels 30 kilometers in two hours, her average speed is… A - 30km/h
B - 60km/h
C - 15km/h
D - 2km/h

I will mark 5.0 star and heart if you explain it and answer correctly

Which accurately compares concave and convex lenses?

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm

Properties seen when one one substance changes to another are known as properties