Given that $a$ and $b$ are real numbers such that $-3\leq a\leq1$ and $-2\leq b\leq 4$, and values for $a$ and $b$ are chosen at random, what is the probability that the product $a\cdot b$ is positive? Express your answer as a common fraction.
7*5 = 35. Then (3*2) + 4 = 10, so the probabiity is 10/35 = 2/7.
