book Maths Puzzle Numerical Ability

Can someone help with this growth and decay problem please...

The proportion of carbon 14 still present in a sample after t years is given by e^-0.00012t. Estimate the age of

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book Other Question

the sum of three numbers is 137. the second number is four more than two times the number. the third number is 5 less than three times the first number. find the three numbers. A vending machine has 41.25 in it. There are 255 coins total and the machine only takes nickels, quarters, and dimes. There are twice as many dimes as nickels. How many of each are in the machine.