exam Maths Puzzle Numerical Ability

Find the value of the six trigonometric functions a=2 b=3 c=?

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Please help!!
The growth in the population of a certain rodent at a dump site fits the exponential function, A(t)=336e^(0.031t), where t is the number of years since 1963. Estimate the population in the year 2000. can you help me with problem? it is from a multiple choice hand out.

f is a function defined by f(x)= -x/5 and
g is a funciton defined by g(x)= 7-3x then
4g-5f=

thanks for any help