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3 years ago

If you flip a coin 4 times, what is the probability that you will get exactly 2 tails?

Mathematics

1 answer:

ioda3 years ago

5 0

Answer:

0.375

Step-by-step explanation:

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The measure of Someone please help me!!!!

lutik1710 [3]

Answer:

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Step-by-step explanation:

height of a man =1.7m

height of a woman =1.6m

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3 years ago

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Alborosie

Answer: Dominant. The answer is dominant.

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3 years ago

15. Explain Shane says a straight angle always has 180° degrees. Is he correct? Explain.

topjm [15]

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3 years ago

25x^-4-99x^-2-4=0 <br> How do I solve for this?

OlgaM077 [116]

Given

$25x^{-4} - 99x^{-2} - 4 = 0$

consider substituting $y=x^{-2}$ to get a proper quadratic equation,

$25y^2 - 99y - 4 = 0$

Solve for $y$ ; we can factorize to get

$(25y + 1) (y - 4) = 0$

$25y+1 = 0 \text{ or } y - 4 = 0$

$y = -\dfrac1{25} \text{ or }y = 4$

Solve for $x$ :

$x^{-2} = -\dfrac1{25} \text{ or }x^{-2} = 4$

The first equation has no real solution, since $x^{-2} = \frac1{x^2} > 0$ for all non-zero $x$ . Proceeding with the second equation, we get

$x^{-2} = 4 \implies x^2 = \dfrac14 \implies x = \pm\sqrt{\dfrac14} = \boxed{\pm \dfrac12}$

If we want to find all complex solutions, we take $i=\sqrt{-1}$ so that the first equation above would have led us to

$x^{-2} = -\dfrac1{25} \implies x^2 = -25 \implies x = \pm\sqrt{-25} = \pm5i$

8 0

2 years ago

-4M = 48 What would you do to each side of the equation?<br> Pls responddd

horrorfan [7]

Answer:

divide by - 4

Step-by-step explanation:

Given

- 4M = 48 ( isolate M by dividing both sides by - 4 )

M = - 12

3 0

3 years ago