Mr. Chiu made a dot plot after asking his students a question. A dot plot titled How Many Hours Did you Study for the Math Test Question mark going from 0 to 6. 0 has 1 dot, 1 has 2 dots, 2 has 3 dots, 3 has 2 dots, 4 has 1 dot, 5 has 2 dots, and 6 has 1 dot.

Based on the dot plot, which statements are correct? Check all that apply.
Eleven students answered Mr. Chiu’s question.
Twelve students answered Mr. Chiu’s question.
Three people studied for two hours.
Three people studied for three hours.
Everyone who responded studied for at least one hour.
Four people studied for four or more hours.

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

Displacement is the slope of a velocity vs. time graph a. true b. false

Which of these is an intensive property of a substance