**25 POINTS**
Which of the following lists of ordered pairs is a function?

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.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Stacey filled her 1/2 cup of measuring cup seven times to have enough flour for a cake recipe how much flour does the cake recipe calls for