The gcf of 30 and 105

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)