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ehidna [41]
4 years ago
8

Plz help me with this

Mathematics
2 answers:
wlad13 [49]4 years ago
6 0

Answer:  c) i

<u>Step-by-step explanation:</u>

\sqrt{-25}-\sqrt{-16}\\\\=\sqrt{-1\cdot 5\cdot 5}-\sqrt{-1\cdot 4\cdot 4}\\\\=5i-4i\qquad \qquad \qquad \qquad \text{Note: }\sqrt{-1}=i\\\\=i

trapecia [35]4 years ago
3 0

Answer:

i

Step-by-step explanation:

note that \sqrt{-1} = i

Given

\sqrt{-25} - \sqrt{-16}

= \sqrt{25(-1)} - \sqrt{16(-1)}

= \sqrt{25} × \sqrt{-1} - ( \sqrt{16} × \sqrt{-1})

= 5i - 4i

= i

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otez555 [7]

Answer:

Surface area is, 478 square centimeter

Step-by-step explanation:

Surface area (S)of rectangle is given by:

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where,

l is the length

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As per the statement:

A rectangular solid has sides of 7 cm, 9 cm, and 11 cm

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S = 2(7 \cdot 9+9 \cdot 11+11 \cdot 7)

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3 years ago
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7 0
3 years ago
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Vaselesa [24]
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7 0
3 years ago
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