2 years ago

A sea lion was swimming at 5 feet below sea level. The number line shows

Mathematics

1 answer:

Evgesh-ka [11]2 years ago

5 0

Answer:

the answer is d.

Step-by-step explanation:

A PE X

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1) 5x-2y=4. 2) 3x-5y=13 x-2y=5<br>3x+y=9

Natali [406]

$\left\{\begin{array}{ccc}5x-2y=4\\3x+y=9&/\cdot2\end{array}\right\\+\left\{\begin{array}{ccc}5x-2y=4\\6x+2y=18\end{array}\right\\----------\\.\ \ \ \ \ 11x=22\ \ \ \ /:11\\.\ \ \ \ \ \ \ x=2\\\\3\cdot2+y=9\\6+y=9\\y=9-6\\y=3\\\\Answer:x=2;\ y=3$

$\left\{\begin{array}{ccc}3x-5y=13\\x-2y=5\end{array}\right\\\left\{\begin{array}{ccc}3x-5y=13\\x=2y+5\end{array}\right\\\\substitute:\\\\3(2y+5)-5y=13\\6y+15-5y=13\\y=13-15\\y=-2\\\\x=2\cdot(-2)+5=-4+5=1\\\\Answer:x=1;\ y=-2.$

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Y_Kistochka [10]

53 and 17

Step-by-step explanation:

If you add 53 and 17, you get 70.

If you subtract 17 from 53, you get 36. Hope this helps!

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2 years ago

2 1/7 + 9 15/28 + -9 5/14

Free_Kalibri [48]

Answer:

65/28 or 2 9/28

Step-by-step explanation:

Hope this helps!

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2 years ago

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babymother [125]

Answer:

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Step-by-step explanation:

and yes i can read the answers at the bottom

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2 years ago

Determine whether each sample may be biased. Explain.

Naya [18.7K]

Answer:

not number 5 is is biased.

Number 6 is not biased.

Number 7 is not biased.

Step-by-step explanation:

Biased means of an estimator is the difference between this estimator's expected value and the true value of the parameter being estimated.

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2 years ago