Question

a) 20 - ( - 45 ) : ( - 3 )2 + ( - 2 ) . ( - 1 )5

Answer 1

$20 - (-45):3^{2} + (-2).(-1)^{5} \\\\ 20 - (-\frac{45}{9}) + (-2).(-1) \\\\ 20 - (-\frac{45}{9}) + 2 \\\\ 20 - (-5) + 2 \\\\ 20 + 5 + 2 \\\\ 27$

;)