Identify a potential source of bias (if any). using random digit dialing, 1599 people were called and asked what obstacles (such as childcare or long hours at work) kept them from exercising. (source: yankelovich partners, inc. for shape up america! )

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5