How much time will it take for an amount of 450 to yield 81 as interest at 4.5% per annum of simple interest?

Technically speaking, histograms are another version of bar charts, if you need to work one out then skim through google hope-o that -o!

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.