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monitta
3 years ago
10

A teacher bought 12 packets of crayons. Seven of the packets had 9 crayons. How many crayons did the teacher buy in all?

Mathematics
1 answer:
zubka84 [21]3 years ago
3 0
The answer is 113!Give me a crown if I was right:/
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Find the area of the triangle whose vertices are (2, 3); (-1, 0); (2, -4)...
Neko [114]

Answer:

Area = 14.5

Step-by-step explanation:

Let's label the given coordinates A, B, C;

Thus;

A = (2, 3)

B = (-1, 0)

C = (2, -4)

From the coordinate geometry formula, the formula for area of a triangle with 3 vertices is;

Area = [Ax(By - Cy) + Bx(Cy - Ay) + Cx(Ay - By)]/2

Area = [2(0 - (-4)) + (-1)(-4 - 3) + 2(3 - (-4))]/2

Area = 29/2

Area = 14.5

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final answer:

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2 years ago
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