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

Solve the system by addition or substitution.
10x-5y=17
y=2x-3 A bathtub can be filled in 20 minutes with both faucets running. If the cold water faucet runs twice as fast as the hot water, how long would it take the cold water faucet to fill the tub itself?