Question

a computer program models a forest. a sprite of a coati is 234 pixels to the left of the edge of the screen. when a lizard sprite appears on the screen, the coati sprite moves 173 pixels to the right and 45 pixels down. the following equation describes this situation. $-234 + 173 = -61$ what does $-61$ tell us? choose 1 answer: a the sprite of the coati moves 61 pixels farther away from the lizard sprite. b the sprite of the coati ends 61 pixels to the left of the edge of the screen. c the sprite of the coati moves 61 pixels down.

Explanation:

• Analyze the position representation: Let the right - hand side of the screen edge be the positive direction. Initially, the coati sprite is 234 pixels to the left of the screen edge, so its position is represented as - 234 (negative because it is to the left of the edge).
• Analyze the movement: When it moves 173 pixels to the right, we add 173 to its initial position. The calculation is - 234+173=-61.
• Analyze option A: The movement to the right should bring the coati sprite closer to the lizard sprite (assuming the lizard sprite is on the screen, probably towards the right - hand side or at least not making the coati sprite move farther away in the horizontal direction related to the lizard). So option A is incorrect.
• Analyze option B: The result - 61 means that after moving 173 pixels to the right from its initial position (234 pixels left of the screen edge), the coati sprite is 61 pixels to the left of the screen edge (because the value is negative, indicating a position to the left of the edge). This matches the meaning of - 61.
• Analyze option C: The equation - 234 + 173=-61 is about the horizontal (left - right) movement, not the vertical (up - down) movement. The 45 pixels down is a separate vertical movement and is not related to this equation. So option C is incorrect.

Answer:

B. The sprite of the coati ends 61 pixels to the left of the edge of the screen.