You can use calculus ( related rates). Given the rate os change of the radius for example you can find the rate of change of volume using differential calculus.
€10 I think as you halve the £3 to get £1.50
Answer:
Your answer is y.
Step-by-step explanation:
4y+2y-5y given
=6y-5y add
=y subtract
5pi/4
7pi/4
13pi/4
Those are the answers to your question have a nice day