exam Maths Puzzle Numerical Ability

Graph the function

f(x)- -2x-5

Hint: This is just like the equation y = mx + b

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exam Other Question

An inlet pipe can fill a tank in 6 minutes. A drain can empty the tank in 8 minutes. If the tank is empty and both the pipe and drain are open, how long will it take before the tank over flows? Not sure if this goes here but I really need help. Thanks!

A certain type of bacteria grows according to the function
f(t)= 5000e^.4055t, where t is measured in hours. What will the population be in 9 hours?

Thanks for any assistance.