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.

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

Modern weaponry has increased the number of deaths in wars and violent conflicts.

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