3 years ago

If xy is rational, must either x or y be rational?

Mathematics

1 answer:

elena-s [515]3 years ago

8 0

Both x and y must be rational.

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A: 1/2 inch <br> B: 1 inch <br> C: 2 inches<br> D: 1/32 inch

mote1985 [20]

The expression of the height is

$a_n=8\cdot (\frac{1}{2})^{n-1}$

the index "n" is the numbers of times that the ball is down, to n=1 the height is 8 inches, to n=2 the height is 4 inches.

An when n=5, the height is

$a_5=8\cdot (\frac{1}{2})^{5-1}=8\cdot (\frac{1}{2})^4=\frac{1}{2} =0.5$

the anwers is 0.5 inches

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3 years ago

WILL GIVE BRAINLIEST!!!

ELEN [110]

Answer:

C is the answer.

Step-by-step explanation:

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3 years ago

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If f(x) = 4(3x - 5), find f^-1(x)

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