Question

form b continued
4 brendan throws a rock into a pond. the bottom of the pond is -12.6 ft from the surface of the pond. brendan is on a patio that is 2.7 ft above the pond. how many feet apart are brendan and the rock? record your answer on the grid. then fill in the bubbles.
image of a grid with bubbles
5 part a complete the model to find -9 + 9. show your work.
image of a number line from -10 to 10
solution ______

Explanation:

Step1: Understand the number line model

The number line has points from -10 to 10. We start at -9 (since we need to find -9 + 9).

Step2: Move on the number line

To add 9 to -9, we move 9 units to the right on the number line. Starting at -9, moving 9 units right: -9 + 9 = 0. We can also think of it as the sum of a number and its additive inverse is 0. Since 9 is the additive inverse of -9, their sum is 0.

Answer:

0