Ahelicopter flies 168 miles against the wind in 2 hours; with the wind, it can fly 252 miles in the same amount of time. find the speed of the helicopter in still air.

Plss anybody know how to do this? ? i need the answers from a through d

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer

Talia is manufacturing rolls of wire for hanging pictures. she needs a material that is so that it can easily be pulled into wire without breaking.