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3 years ago

7

The bed of a longbed pickup truck measures 4 feet by 8 feet. Which is the length of the longest thin metal bar that will lie fla

t in the bed?
A 11 ft 3 in.
B 8 ft 9 in.
C 8 ft 11 in.
D 10 ft 0 in.

1 answer:

Dafna1 [17]3 years ago

7 0

Answer: B. 8ft 11 in.

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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

The value of $i$ is $i=\sqrt{-1}[tex] or [tex]i^{2}=-1[\tex].Now [tex]i^{4}$ in term of $i^{2}[\tex] can be written as, [tex]i^{4}=i^{2}\times i^{2}$

Substituting the value,

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Substituting the value,

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Now $\sqrt{-81}$ can be written as follows,

$\sqrt{-81}=\sqrt{\left(81\right)\times\left(-1\right)}$

Applying radical multiplication rule,

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$\sqrt{\left(81\right)\times\left(-1\right)}={\sqrt{81}}\sqrt{-1}$

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Now substituting the above values in given expression,

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Simplifying,

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Collecting similar terms,

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Combining similar terms,

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The above expression is in the form of a+bi which is the required expression.

Hence, option number 4 is correct.

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