Help plzz its a test

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x

The length of time it takes to find a parking space at 9 a.m. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. find the probability that it takes at least 8 minutes to find a parking space. (round your answer to four decimal places.)