To approach a runway, a plane must begin a 7° descent starting from a height of 3 miles above the ground. to the nearest mile, how many miles from the runway is the airplane at the start of this approach?

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.