WeBWorK using host: https://webwork.pcc.edu, format: simple, seed: 14, course: orcca

Since $13\cdot2=26$ and we are multiplying numbers of opposite signs, the answer is negative: $-26\text{.}$

Since $30\cdot50=1500$ and we are multiplying numbers of opposite signs, the answer is negative: $-1500\text{.}$

Since $12\cdot7=84$ and we are multiplying numbers of the same sign, the answer is positive: $84\text{.}$

Any number multiplied by $0$ is $0\text{.}$