exam Maths Puzzle Numerical Ability

i want to know how you find the area of an equilateral triangle (regular 3-gon) with the given measurement.

6-inch side.

A = sq. in.

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4x-3/5=3x+1/10 and 6x+3(x-0.2789)=4(2x+0.3912)
The two problems above are in the homework assignment, but the book doesn't get into how to solve them. Thanks in advance A population is increasing at a rate of 0.6% each year. The population is currently 3000. find the function p(t)that gives the size of the population t years from now.