exam Maths Puzzle Numerical Ability

Please help me solve this problem:
the direction are as follow: Find the domain of the function, use interval notation:

f(x)= 3 divided by (x+4)

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exam Other Question

A boat travels at a rate of 15 kilometers per hour in still water. It travels 60 kilometers upstream in the same time that it travels 90 kilometers downstream. What is the rate of I am lost. can you help me.

Rewrite the equation 2x - 9y = -72 as a function of x

Thanks