exam Maths Puzzle Numerical Ability

I need help performing the indicated operation

f(x)=5x+15, g(x)=3x-1

I need to find (f og)(x)

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exam Other Question

1-tan5Btan2B = (2cos7B/(cos7B + cos3B)) please answer these problems i need help. thank you. working with fractions
1. 1/4=3-2x-1/x+2
2.x^3/2=125
3.3square root x-4=2
show all your work thank you