At 7 pm last night the temperature change from was 10°f at 7am the next morning the temperature was -2 by how much did the temperature change from 7pm to 7am

What expression is equivalent to 42x-56y

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Dawn is selling her mp3 player for 3 4 of the original price. the original price for the mp3 player was $40. how much is she selling her mp3 player for?