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2 years ago

Clara simplifies {8b-4r}- {2b-r} and says the result is 6b-5r. What error did Clara make?

Mathematics

2 answers:

Nady [450]2 years ago

8 0

She regrouped the numbers instead of multiplying like 8b(2b-r) -4r(2b-r).

GREYUIT [131]2 years ago

3 0

She did not distribute the negative. Poor Clara.

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If a pond has a major axis of 68 feet and a minor axis of 32 feet how far apart are the foci

Bogdan [553]

Answer:

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Step-by-step explanation:

we are given

a pond has a major axis of 68 feet

so, $a=\frac{68}{2} =34$

a minor axis of 32 feet

so, $b=\frac{32}{2} =16$

now, we know ellipse formula

$c^2=a^2-b^2$

where

c is the distance between center and focus

so, we can plug it and find c

$c^2=34^2-16^2$

$c=30$

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$=2c$

$=2\times 30$

$=60$

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