What will be the perimeter and the area of the rectangle below if it is enlarged using a scale factor of 2.5?
1 answer:
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Domain is the entire span left to right (on the x-axis) that the graph is on. Since the graph goes from x=-4 and ends at x=4, the domain would be from -4 to 4. The circle at -4 is open, so it does not include the point at -4, just everything leading up to it. So, the domain would be
The range is similar, it is the entire span that the graph goes up and down (on the y-axis). The graph starts at the bottom at y=-2, and ends at y=5. The bottom point (4,-2) is closed, so the graph includes that point, and the top point (-4,5) is open and doesn't include the point. Therefore, the range would be
In order to solve this triangle we must use cosine law:
Now let's plug in the values we are given:
Now let's plug in the values we are given: