Iam really stuck methwith there questions a) -42+(-17)b) )c) 8(-9)d)-42÷(-7)e)-2(-)f)-18-7) squeredh) -5 squered

If x+y+z=0 what is the value of [tex] {x}^{3} + {y}^{3} + {z}^{3} [/tex]

Which polynomial is in standard form? 3xy+6x®y2 - 4x4y + 19x? y* 18x5 - 7x{y-2xy2 + 1774 x5y5 - 3xy - 11x? y2 +12 15+ 12xy2 - 11x®ys +5x? y2 ?

Consider the diagram. lines e and c can be described as