Gail is wondering when the Sun will set. He knows that when his arm is fully extended, the width of one finger is approximately equal to the distance the Sun travels in fifteen minutes. Gail extends his arm, counts four fingers between the Sun and the horizon, and predicts the Sun will set in about one hour. How did Gail use math to help him determine approximately how long it would take for the Sun to reach the horizon? He used estimation.

He used significant figures.

He used precision.

He used accuracy.

He used summary statistics.

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.