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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exam Other Question

Simplify the expression by combining like terms.
18). -9y + 6 - 3 + 2 + y - 5
how is this problem solved? [1/8] with exponent of -4/3