Triangle QRS is an enlargement of triangle ABC with scale factor 3. If the area of triangle QRS is 72cm squared, find the area of triangle ABC.​

648 sq. cm.

Step-by-step explanation:

When a figure is scaled, it means that all of its dimensions are increased or decreased by the same factors.  Therefore, increasing the base by 3 times and the height by three times means that the total area is increased by 3 squared times, or 9.  So the anser is 72*9, or 648 sq. cm.

exa:

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3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

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