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Iteru [2.4K]
2 years ago
9

Pls help answer i dont not need explaination :)

Mathematics
2 answers:
nadezda [96]2 years ago
3 0

Answer:

165 km ^2

Step-by-step explanation:

meriva2 years ago
3 0

Answer:

165 km²

Step-by-step explanation:

<u>First, let us find the area of the big rectangle.</u>

Area = length × Width

Area = 15km × 13 km

Area = 195 km²

<u>Now, let us find the area of the small rectangle.</u>

Area = length × width

Area = 6 km × 5 km

Area = 30 km²

<u>And now, let us find the area of the shaded region.</u>

<em>For that, we have to subtract the area of the small rectangle from the area of the big rectangle.</em>

Area = 195 km² - 30 km²

Area = <u>165 km²</u>

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The cost of 3 notebooks and 4 pencils is $8.50. Determine the cost of one notebook and one pencil
Assoli18 [71]
Call the notebooks x, and the pencils y. 
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<span>Then just solve as simultaneous equations: </span>
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<span>15x + 20y = 42.5 </span>
<span>15x + 24y = 43.5 </span>

<span>Think: DASS (Different Add, Similar Subtract). 15x appears in both equations so subtract one equation from the other. Eassier to subtract (15x + 20y = 42.5) from (15x + 24y = 43.5) </span>

<span>(15x + 24y = 43.5) - (15x + 20y = 42.5) = (4y = 1) which means y = 0.25. </span>

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<span>15x + 5 + 42.5 </span>
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<span>So x (notebooks) are 2.5 ($2.50) each and y (pencils) are 0.25 ($0.25) each.</span>
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