Andrea doubles as a professional pianist and a dedicated mother. She identified a few quantitative relationships and modeled them: Which of the following represents the duration of Andrea's practice session before a concert as a function of the number of times her baby wakes up at night?

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?