exam Maths Puzzle Numerical Ability

evaluate the function for the value specified.

f(x)=xsec.power-7x+10; find (a)f(0),(b)f(5), and (c)f(-2)

I am really confused on this one. Thanks

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exam Other Question

find the equation of the line that is perpendicular to the line y=2x-3 and passes through the point (-2,6) Solve each of the following by graphing
x-y=4
2x-2x=8