MATH SMARTIES (PLZ ANSWERE IF YOU KNOW WHAT A TREE DIAGRAM IS)I NEED HELP CAN YOU TELL ME IF MY ANSWER IS CORRECT AND IF NOT CORRECT COULD YOU PLZ TELL ME THE CORRECT ANSWERE

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

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.

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees