Question

# (−1.5)^{11}times (−1.5)

Negative numbers and coordinate plane
$$\displaystyle{\left(−{1.5}\right)}^{{{11}}}\times{\left(−{1.5}\right)}$$
Since $$\displaystyle{\left(−{1.5}\right)}={\left(−{1.5}\right)}^{{{1}}}$$, then using the Product of Powers Rule gives:
$$\displaystyle{\left(−{1.5}\right)}^{{{11}}}\times{\left(−{1.5}\right)}={\left(−{1.5}\right)}^{{{11}}}⋅{\left(−{1.5}\right)}^{{{1}}}={\left(−{1.5}\right)}^{{{11}+{1}}}={\left(−{1.5}\right)}^{{{12}}}$$