A researcher is trying to estimate the percentage of adults who exercise daily. Using a simple random sample, the researcher found a mean of 23% of adults, but he has a margin of error of 10%.
--- What is the range that includes the actual mean percentage of adults who exercise daily?
--- What could he do to lower the margin of error?

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000

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