3 years ago

Which expression is equivalent to 36 + 42 ?

1 answer:

7 0

It’s is option D hope this helped

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gizmo_the_mogwai [7]

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VLD [36.1K]

You are finding the square root of 121
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Leona [35]

Answer:

Following are the solution to the given choices:

Step-by-step explanation:

In point a:

Calculating the variance of the test grade:

$\to var(A+B)=var A + var B + 2 cov(A,B)$

$=25+36+2(0.8)\\\\=25+36+1.6\\\\=62.6$

In point b:

$\to var(A-B)=varA + var B - 2 cov(A,B)$

$=25+36-2(0.8)\\\\=25+36-1.6\\\\=59.4$

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Digiron [165]

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