Die korrekte Antwort lautet:
10 ⋅ ( - 8 ) = -80

$(49-\left(45+59\right))·20$

= $\left(49-45-59\right)·20$

= $-55·20$

= $-1100$

$-2^2+2\cdot {\left(-2\right)}^3$

= $-4+2\cdot \left(-8\right)$

= $-4-16$

= $-20$