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
Rewrite the equation in function form by solving for y
x-2y=4 problem 83 need help.


2 times a numbed, increaded by 28, is less than or equal to 6 times that number.

x is nonegative.

I thought it was x > 0 but I was wrong..