A-Level Maths: D4-11 Arithmetic Sequences: Sum of 1st-10th is 506.5, Sum of 8th-16th is 321.3

[callumcosens]

If you're using the classwiz calculator which I think is the minimum you need for A - Level, there's a simultaneous equation solver on it if you go into the menu and go on the equation tab. Just to save you some work solving them manually :)

[rawrrii]

Who knew this topic was this simple wow great teach!!

[dannychiu]

3:30 Surely it should have been 120d - -21d so it should be 141d?

[CamHarrisVlogs]

With a question like this, would it state that the sequence is ARITHMETIC? As how are you supposed to know whether to use the Arithmetic series formula or the Geometric series formula? Thanks