book Maths Puzzle Numerical Ability

Describe the transformation of:
f(x)= -2(x-5)cubed+3

compared to its common function.

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I can not figure this out>>>> Thanks for your help
Marta leaves home at 9 am bicycling at a rate of 24 mi/h two hours later John leaves driving at a rate of 48 mi/h at what time will john catch up with Marta A salesperson earns $350 per week plus 10% of her weekly sales. Find the sales necessary for the slaesperson to earn at least $800 in one week.