Please help///quickly im being timed//also please show your workdue in 15 mins 4. A radioactive compound has a half-life of 50 years. When will there be less than 20% of anoriginal quantity left?

5. How many years did it take you to pay off an $45,000 car at 18% simple interest if you paid a total of $85,500?

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.