tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?
form a ratio 1: 12 = 2: 8
let's start by ruling out answers. b and c are way too much, as c is the weight of a teenager, and b is way too heavy to even comprehend.
because 10^20 or 10^-20 are very small amounts, we can also rule a out to get that the answer is d.
i don't know what the scenarios are but an exponential decay is when something decreases over time. on a graph its a curved line on the graph.