Rates of change

(* Ignore this section* - wk 6, 8E Q14) )

Please answer the questions on the attachment below. ( ON PAPER/WRITTEN ) ( KEEP WORKING OUT AND EXPLANATION SEPERATE)

(Format

Given:

Working solution

Answer:)

14 The amount of chlorine in a jug of water t hours after it was filled from a tap is C = - 20 t+ 1 , where C is in millilitres. Find the rate of decrease of chlorine 9 hours after being poured