The sign only changes when divided or multiplied by a negative number.
Answer:
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Step-by-step explanation:
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Answer: 280 cm
Step-by-step explanation:
The base of each of the congruent triangles ABD and CBD is BD= 28 cm. The height of each is the perpendicular 10cm.
A=(2)(bh/2) works out to A= bh since the 2/2 cancel
So 10cm × 28cm = 280cm²
Yes his equations are correct
Answer:28
Step-by-step explanation: