MATH EXPONENTIAL HELP ASAP!!!?

The grass on a golf course needs to be cut when it reaches a height of 3 cm. If the height of the grass is 15 mm on Sunday and it grows at a rate of 3 mm per day, when is the next day it should be cut? 

2. How many terms are there in the sequence: 10, -6, 18/5, -54/25, .... -4374/15625 ?

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