exam Maths Puzzle Numerical Ability

Hi, I need help finding the domain and range for this piecewise defined function
.
f(x) = { x + 6,{{{ x <= -4 }}} }
......{ x + 10,{{{ -4<x<8 }}}
......{ 30, {{{ x >= 8 }}} }

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The Free Indeed Company manufactures ladies shoes that are sold through discount houses. The shoes are sold for $20 each pair; the fixed costs are $110,000 for up to 30,000 pairs A real estate agent received a 3.5% commission on the sale of a home. If the home sold for $61,000, how much was his commission?