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AveGali [126]
3 years ago
12

Need help....ASAP on both 7 AND 8

Mathematics
1 answer:
Kitty [74]3 years ago
6 0

Answer:

7)Amount of calories Ethan would burn running for 5 hours in one week= 650\times5=3250 calories

8)Erosion caused by wave for 8 years would be= 3\times8=24cm

Step-by-step explanation:

7) Ethan burns 650 calories on running for an hour.

Amount of calories he would burn running for 5 hours in one week= 650\times5=3250 calories

8) Erosion caused by wave per year =3 cm

Erosion caused by wave for 8 years would be= 3\times8=24cm

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

EQ1:  x + y = 12     --> x = 12 - y

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    ↓     ↓         ↓

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.\  y=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\\\.\quad =\dfrac{-(-12)\pm \sqrt{(-12)^2-4(1)(15)}}{2(1)}\\\\\\.\quad =\dfrac{12\pm \sqrt{144-120}}{2}\\\\\\.\quad =\dfrac{12\pm \sqrt{24}}{2}\\\\\\.\quad =\dfrac{12\pm 2\sqrt{6}}{2}\\\\\\.\quad =6\pm \sqrt{6}

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x^2+y^2=\dfrac{21\pm 6\sqrt6}{2}+42\pm 12\sqrt6\\\\\\.\qquad \quad = \dfrac{21\pm 6\sqrt6}{2}+\dfrac{84\pm 24\sqrt6}{2}\\\\\\. \qquad \quad = \dfrac{105\pm 18\sqrt6}{2}

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