20 point full workings to 3 questions. Full as answers already shown.
1st; Basic integration
2nd; Gradients and Perpendiculars
3rd; Solving inequalities
Explain or show workings to these 3 questions.

The volume of a cube is 8 in to the 3rd power. how long is each side?

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212