An integrated circuit voltage of 0.9 volts decreases by 0.2 volts per second how long does it take to reach a voltage of 0.3 volts

V(t) = 0.9 - 0.2t = 0.3, t=?

-0.2t = 0.3-0.9
0.2t = 0.6
t = 5*0.6 = 3 seconds

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.