2 years ago

Which one doesn’t belong with the other three? Explain your reasoning plz plz answer #3

1 answer:

6 0

Ok so
The answer would be the second one (3+3+3+3=3 (4) )
Here's the explanation
It doesn't belong there because all the rest have to do with exponents
And that problem does not
Also,that problem uses repetitive addition while the other ones use repetitive multiplication
Hope this helps :)

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A rectangular field with perimeter of 80m is to have an area of at least 380m² . Describe the possible lengths and of the field.

Kryger [21]

$let \: x \: be \: the \: length \\ let \: y \: be \: the \: width$

$perimeter = 2x + 2y \\ area = xy$

$2x + 2y = 80 \\ xy = 380 \\ \\ x + y = 40 \\ xy = 380 \\ \\ x = 40 - y \\ (40 - y)y = 380$

$40y - y {}^{2} = 380 \\ y {}^{2} - 40y + 380 = 0 \\ y {}^{2} - 40y + 400 = 20 \\ (y - 20) {}^{2} = 20 \\ y - 20 =± \sqrt{20} \\ y_{1}=20-√20≈15.52786\\ y_{2}=20+√20≈24.4721$