Geometric sequence practice
The first three terms of a geometric sequence are \(5, -15, 45\). Find \(r\), then calculate \(u_{6}\) and \(S_{6}\).
Worked practice: sequences and series
Find the common change or ratio, then use it to calculate the requested term or sum.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.