Is the data set approximately periodic? if so, what are it’s period and amplitude?

We used the variable  previously to show an angle in standard position, and we also referred to the sine and cosine functions as  and . Often the sine and cosine functions are used in applications that have nothing to do with triangles or angles, and the letter x is used instead of  for the input (as well as to label the horizontal axis). So from this point forward, we’ll refer to these same functions as  and . This change does not affect the graphs; they remain the same. You know that the graphs of the sine and cosine functions have a pattern of hills and valleys that repeat. The length of this repeating pattern is . That is, the graph of  (or) on the interval  looks like the graph on the interval  or  or . This pattern continues in both directions forever. The graph below shows four repetitions of a pattern of length. Each one contains exactly one complete copy of the “hill and valley” pattern.

no, the equation would be invalid since they are both not equal.

step-by-step explanation:

here you got

4y-6+4y 2-9

first, you would simplify the equation on the form.

4y-6+4y 2-9

then, move all the terms that contains a y to the left and all the other terms to the right.

+4y-4y+-9-6

finally, you will simplify the left and the right side of the equation.

y=-3