Answer: Ok, the product of 16 and the time is written as where t is the time. 16 is a scalar and t has units of seconds, so this equation has units of seconds.
when it says "after the start", it means that you waited seconds after the "start" of something.
If we set the time of start as t₀, then "the product of 16 and the time after the start" is : t₀ + s
Perpendicular lines have slopes that are negative reciprocals. example: line a has a slope of 2/3, line b has a slope if -3/2 if they are perpendicular.