Mathematics: Plz all 4 for, one answer. which one is it?

Plz all 4 for, one answer. which one is it?

stephany6523

10.01.2022

the first one is correct.

Step-by-step explanation:

because when he picks the first quarter he puts it back. the amount is still the same, so when he chooses his second the numbers won't change

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naniicapri3

30.01.2023

(2,√21)

Step-by-step explanation:

The circle centered at the origin has equation:

${x}^{2} + {y}^{2} = 25$

Any point that satisfies this equation lie on this circle.

When x=2, we substitute and solve for y.

${2}^{2} + {y}^{2} = 25 \\ 4 + {y}^{2} = 25 \\ {y}^{2} = 25 - 4 \\ {y}^{2} = 21$

Take square root to get:

$y = \pm \sqrt{21}$

Therefore (2,-√21) and (2,√21) are on this circle.

From the options, (2,√21) is the correct answer

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