exam Maths Puzzle Numerical Ability

find the approximate numerical value of e4

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exam Other Question

Looking for any help involving functions and domains. Thanks very much!
Find the requested value.
f(3) for f(x)={3x+1, if x<1
3x, if 3 (lesser than or equal to si
In a chemistry class, 12 L of a 12% alcohol solution must be mixed with a 2% solution to get a 14% solution. How many liters of 20% solution are needed?