10 out of 40 pencils in Ms. K's class are missing erasers. What percent
of the pencils are missing erasers in
Ms. K's class?

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)