3 years ago

HELP!! :(

1 answer:

4 0

If a function wouldn't represent area of a circle its domain would be all real numbers. For any number r we can calculate f(r)

But since radius of circle cannot be negative and it also doesnt make sense that it is 0 the answer would be all positive real numbers

Answer is a.

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Solve for X and solve for Y?

Llana [10]

Answer:

$x=3\sqrt 5\\$

$y = \sqrt {126}$

Step-by-step explanation:

By geometric mean property:

$x = \sqrt{9 \times 5} = \sqrt{45} = 3 \sqrt{5} \\ \\ by \: pythagoras \: theorem \\ \\ {y}^{2} = {9}^{2} + {x}^{2} \\ \\ {y}^{2} = {9}^{2} + {(3 \sqrt{5}) }^{2} \\ \\ {y}^{2} = 81 + 45 \\ \\ {y}^{2} = 126 \\ \\ y = \sqrt{126}$