exam Maths Puzzle Numerical Ability

Can I have some help finding the inverse function of f.
f(x)=1/(-10 x^2 + 6),text( )x>=0

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exam Other Question

What is LCM of 14and 15 Please help solve
The population growth for each year is 1000
Fill in the chart for the population
year(t) population(P)

t=0