Two less than is 3 times a number is the number as a equation

This is the equation: 3x-2=5x+15 
you combine like terms: 3x-3x-2=5x-3x+15 
the 3x on the left cancles out: -2=2x+15 
subtract 15 on both sides: -2-15=2x+15-15 
the 15 on the right cancles out:--17=2x 
divide by 2: -17/2=2x/2 
x equals negative 8.5: x=-8.5

6/9 i need more characters in my answer

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.