While in flight, a hot air balloon decreases its elevation by 83 meters and then increases its elevation by 83.7 meters,
Enter an inequality in the ber to compare the changes in elevation of the hot air balloon while in flight. this is math that i dont get pls help

Explanation:

Let the initial height of the balloon is L .

The lower level is L - 83 , because it goes 83 m downwards

The upper limit is L + 83.7 , because it goes up by 83.7 m

Thus the inequality becomes

L-83 ≤ L ≤ L + 83.7

b.a device that inputs heat into a cool object