Identify a potential source of bias (if any). Using random digit dialing, 1599 people were called and asked what obstacles (such as childcare) kept them from exercising. (Source: Yankelovich Partners, Inc. for Shape Up America!)

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?