In a bag there are 10p coins, 20p coins and 50p coins. There are three fewer 20p coins than 10p coins.
There are seven more 50p coins than 10p coins.

B) although, there are 61 coins. Work out the total value of the 20p coins. Give your answers in pounds.

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.