Amountain climber climbed a cliff 50 feet at a time. he did this 5 times in one day. what was the overall change in his elevation

Step-by-step explanation:

The overall change is -150 feet. 50 times 5 is 150 feet, and the mountain climber descended. Therefore, the change is -150 feet in elevation.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

9x